diff --git a/.idea/modules.xml b/.idea/modules.xml
index ba252c2..5074956 100644
--- a/.idea/modules.xml
+++ b/.idea/modules.xml
@@ -3,7 +3,9 @@
   <component name="ProjectModuleManager">
     <modules>
       <module fileurl="file://$PROJECT_DIR$/Github-for-Developer.iml" filepath="$PROJECT_DIR$/Github-for-Developer.iml" />
+      <module fileurl="file://$PROJECT_DIR$/app/Github-for-Developer-app.iml" filepath="$PROJECT_DIR$/app/Github-for-Developer-app.iml" />
       <module fileurl="file://$PROJECT_DIR$/app/app.iml" filepath="$PROJECT_DIR$/app/app.iml" />
+      <module fileurl="file://$PROJECT_DIR$/git-Github-for-Developer.iml" filepath="$PROJECT_DIR$/git-Github-for-Developer.iml" />
     </modules>
   </component>
 </project>
\ No newline at end of file
diff --git a/.idea/navEditor.xml b/.idea/navEditor.xml
new file mode 100644
index 0000000..b5f64af
--- /dev/null
+++ b/.idea/navEditor.xml
@@ -0,0 +1,31 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="navEditor-manualLayoutAlgorithm2">
+    <option name="myPositions">
+      <map>
+        <entry key="bottom_navigation.xml">
+          <value>
+            <LayoutPositions>
+              <option name="myPositions">
+                <map>
+                  <entry key="mainFragment">
+                    <value>
+                      <LayoutPositions>
+                        <option name="myPosition">
+                          <Point>
+                            <option name="x" value="76" />
+                            <option name="y" value="256" />
+                          </Point>
+                        </option>
+                      </LayoutPositions>
+                    </value>
+                  </entry>
+                </map>
+              </option>
+            </LayoutPositions>
+          </value>
+        </entry>
+      </map>
+    </option>
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/render.experimental.xml b/.idea/render.experimental.xml
new file mode 100644
index 0000000..881b33d
--- /dev/null
+++ b/.idea/render.experimental.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="RenderSettings">
+    <option name="quality" value="0.75" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
index 7780ded..d4d8e01 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -66,16 +66,18 @@ jacocoAndroidUnitTestReport {
 dependencies {
     implementation fileTree(dir: 'libs', include: ['*.jar'])
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
-    implementation 'androidx.appcompat:appcompat:1.0.2'
+    implementation 'androidx.appcompat:appcompat:1.1.0'
     implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
+    implementation 'com.android.support:design:28.0.0'
 
     // test implementation
+    implementation 'androidx.legacy:legacy-support-v4:1.0.0'
     testImplementation 'junit:junit:4.12'
     testImplementation 'org.robolectric:robolectric:4.3'
     testImplementation 'org.powermock:powermock-api-mockito:1.4.12'
     testImplementation 'org.powermock:powermock-module-junit4:1.6.2'
     testImplementation 'org.mockito:mockito-core:2.28.2'
-    testImplementation 'androidx.arch.core:core-testing:2.0.1'
+    testImplementation 'androidx.arch.core:core-testing:2.1.0'
     androidTestImplementation 'androidx.test:runner:1.2.0'
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
     androidTestImplementation 'androidx.test:runner:1.2.0'
@@ -89,7 +91,7 @@ dependencies {
     androidTestImplementation 'androidx.test.espresso:espresso-intents:3.2.0'
 
     // Google Ads
-    implementation 'com.google.android.gms:play-services-ads:18.1.1'
+    implementation 'com.google.android.gms:play-services-ads:18.2.0'
 
     // OkHttp && logger
     implementation 'com.squareup.okhttp3:okhttp:3.12.0'
@@ -106,9 +108,9 @@ dependencies {
     kaptTest 'androidx.room:room-testing:2.1.0'
 
     // Lifecycle components
-    implementation 'androidx.lifecycle:lifecycle-extensions:2.0.0'
+    implementation 'androidx.lifecycle:lifecycle-extensions:2.1.0'
     implementation 'android.arch.lifecycle:viewmodel:1.1.1'
-    annotationProcessor 'androidx.lifecycle:lifecycle-compiler:2.0.0'
+    annotationProcessor 'androidx.lifecycle:lifecycle-compiler:2.1.0'
 
     // Coroutines
     implementation "org.jetbrains.kotlinx:kotlinx-coroutines-core:$coroutine_version"
@@ -129,4 +131,6 @@ dependencies {
 
     //ProgressBar
     implementation 'com.wang.avi:library:2.1.3'
+    implementation 'androidx.navigation:navigation-fragment-ktx:2.1.0'
+    implementation 'androidx.navigation:navigation-ui-ktx:2.1.0'
 }
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 7c305d4..820f394 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -39,6 +39,7 @@
             </intent-filter>
         </activity>
         <activity android:name=".views.MainActivity" />
+        <activity android:name=".views.Main2Activity" />
     </application>
 
 </manifest>
\ No newline at end of file
diff --git a/app/src/main/java/com/seok/gitfordeveloper/views/LauncherActivity.kt b/app/src/main/java/com/seok/gitfordeveloper/views/LauncherActivity.kt
index a14a618..221f41c 100644
--- a/app/src/main/java/com/seok/gitfordeveloper/views/LauncherActivity.kt
+++ b/app/src/main/java/com/seok/gitfordeveloper/views/LauncherActivity.kt
@@ -24,6 +24,6 @@ class LauncherActivity : AppCompatActivity() {
             startActivity(intent)
             overridePendingTransition(R.anim.fade_in, R.anim.fade_out)
             finish()
-        }, 1500)
+        }, 200)
     }
 }
diff --git a/app/src/main/java/com/seok/gitfordeveloper/views/LoginActivity.kt b/app/src/main/java/com/seok/gitfordeveloper/views/LoginActivity.kt
index 0dde242..34ce70f 100644
--- a/app/src/main/java/com/seok/gitfordeveloper/views/LoginActivity.kt
+++ b/app/src/main/java/com/seok/gitfordeveloper/views/LoginActivity.kt
@@ -27,12 +27,15 @@ class LoginActivity : AppCompatActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_login)
-        init()
-        checkForSignIn()
-        login_img_login.setOnClickListener {
-            val intent = Intent(Intent.ACTION_VIEW, Uri.parse(authToken.buildHttpUrl(BuildConfig.GITHUB_CLIENT_ID)))
-            startActivityForResult(intent, HttpURLConnection.HTTP_OK)
-        }
+        startActivity(Intent(this, Main2Activity::class.java))
+        overridePendingTransition(R.anim.fade_in, R.anim.fade_out)
+        finish()
+//        init()
+//        checkForSignIn()
+//        login_img_login.setOnClickListener {
+//            val intent = Intent(Intent.ACTION_VIEW, Uri.parse(authToken.buildHttpUrl(BuildConfig.GITHUB_CLIENT_ID)))
+//            startActivityForResult(intent, HttpURLConnection.HTTP_OK)
+//        }
     }
 
     private fun init() {
@@ -80,7 +83,7 @@ class LoginActivity : AppCompatActivity() {
     }
 
     private fun goToMainActivity() {
-        startActivity(Intent(this, MainActivity::class.java))
+        startActivity(Intent(this, Main2Activity::class.java))
         overridePendingTransition(R.anim.fade_in, R.anim.fade_out)
         finish()
     }
diff --git a/app/src/main/java/com/seok/gitfordeveloper/views/Main2Activity.kt b/app/src/main/java/com/seok/gitfordeveloper/views/Main2Activity.kt
new file mode 100644
index 0000000..14bce3e
--- /dev/null
+++ b/app/src/main/java/com/seok/gitfordeveloper/views/Main2Activity.kt
@@ -0,0 +1,13 @@
+package com.seok.gitfordeveloper.views
+
+import android.os.Bundle
+import androidx.appcompat.app.AppCompatActivity
+import com.seok.gitfordeveloper.R
+
+class Main2Activity : AppCompatActivity() {
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.fragment_main)
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/com/seok/gitfordeveloper/views/MainActivity.kt b/app/src/main/java/com/seok/gitfordeveloper/views/MainActivity.kt
index 68f13bb..62edc74 100644
--- a/app/src/main/java/com/seok/gitfordeveloper/views/MainActivity.kt
+++ b/app/src/main/java/com/seok/gitfordeveloper/views/MainActivity.kt
@@ -4,6 +4,7 @@ import android.graphics.Color
 import androidx.appcompat.app.AppCompatActivity
 import android.os.Bundle
 import android.view.Gravity
+import android.view.MenuItem
 import android.widget.LinearLayout
 import android.widget.TextView
 import androidx.lifecycle.Observer
@@ -11,12 +12,14 @@ import androidx.lifecycle.ViewModelProviders
 import com.bumptech.glide.Glide
 import com.google.android.gms.ads.AdRequest
 import com.google.android.gms.ads.MobileAds
+import com.google.android.material.bottomnavigation.BottomNavigationView
 import com.seok.gitfordeveloper.BuildConfig
 import com.seok.gitfordeveloper.R
 import com.seok.gitfordeveloper.database.Commits
 import com.seok.gitfordeveloper.utils.*
 import com.seok.gitfordeveloper.viewmodel.MainViewModel
 import kotlinx.android.synthetic.main.activity_main.*
+import kotlinx.android.synthetic.main.activity_main2.*
 import org.jetbrains.anko.*
 
 class MainActivity : AppCompatActivity() {
@@ -30,10 +33,18 @@ class MainActivity : AppCompatActivity() {
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
-        setContentView(R.layout.activity_main)
-        init()
-        checkForUserInfo()
-        initViewModelFun()
+        setContentView(R.layout.activity_main2)
+        bottom_navigation.setOnNavigationItemSelectedListener {
+            when(it.itemId){
+                 R.id.nav_menu_f -> longToast("1")
+                R.id.nav_menu_s -> longToast("2")
+            }
+            true
+        }
+
+//        init()
+//        checkForUserInfo()
+//        initViewModelFun()
     }
 
     private fun init() {
diff --git a/app/src/main/java/com/seok/gitfordeveloper/views/MainFragment.kt b/app/src/main/java/com/seok/gitfordeveloper/views/MainFragment.kt
new file mode 100644
index 0000000..969848b
--- /dev/null
+++ b/app/src/main/java/com/seok/gitfordeveloper/views/MainFragment.kt
@@ -0,0 +1,23 @@
+package com.seok.gitfordeveloper.views
+
+
+import android.os.Bundle
+import androidx.fragment.app.Fragment
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+
+import com.seok.gitfordeveloper.R
+
+/**
+ * A simple [Fragment] subclass.
+ */
+class MainFragment : Fragment() {
+    override fun onCreateView(
+        inflater: LayoutInflater, container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        // Inflate the layout for this fragment
+        return inflater.inflate(R.layout.fragment_main, container, false)
+    }
+}
diff --git a/app/src/main/res/layout/activity_main2.xml b/app/src/main/res/layout/activity_main2.xml
new file mode 100644
index 0000000..599a1b9
--- /dev/null
+++ b/app/src/main/res/layout/activity_main2.xml
@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="utf-8"?>
+<FrameLayout
+        xmlns:android="http://schemas.android.com/apk/res/android"
+        xmlns:app="http://schemas.android.com/apk/res-auto"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent">
+
+    <!-- Main content -->
+
+    <com.google.android.material.bottomnavigation.BottomNavigationView
+            android:id="@+id/bottom_navigation"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_gravity="bottom"
+            android:background="@color/colorPrimary"
+            app:itemIconTint="@color/iconText"
+            app:itemTextColor="@color/iconText"
+            app:menu="@menu/bottom_navigation_menu" />
+
+</FrameLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/fragment_main.xml b/app/src/main/res/layout/fragment_main.xml
new file mode 100644
index 0000000..fff873b
--- /dev/null
+++ b/app/src/main/res/layout/fragment_main.xml
@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="utf-8"?>
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+        xmlns:tools="http://schemas.android.com/tools"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        tools:context=".views.MainFragment">
+
+    <!-- TODO: Update blank fragment layout -->
+    <TextView
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"
+            android:text="@string/hello_blank_fragment" />
+
+</FrameLayout>
\ No newline at end of file
diff --git a/app/src/main/res/menu/bottom_navigation_menu.xml b/app/src/main/res/menu/bottom_navigation_menu.xml
new file mode 100644
index 0000000..47254b8
--- /dev/null
+++ b/app/src/main/res/menu/bottom_navigation_menu.xml
@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="utf-8"?>
+<menu xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <item android:id="@+id/nav_menu_f"
+            android:title="@string/navigation_menu_main"
+            android:icon="@mipmap/ic_launcher_foreground_gfd"
+            android:enabled="true"/>
+    <item android:id="@+id/nav_menu_s"
+            android:title="@string/navigation_menu_main"
+            android:icon="@mipmap/ic_launcher_foreground_gfd"
+            android:enabled="true"/>
+</menu>
\ No newline at end of file
diff --git a/app/src/main/res/navigation/bottom_navigation.xml b/app/src/main/res/navigation/bottom_navigation.xml
new file mode 100644
index 0000000..e1e8046
--- /dev/null
+++ b/app/src/main/res/navigation/bottom_navigation.xml
@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="utf-8"?>
+<navigation xmlns:android="http://schemas.android.com/apk/res/android"
+        xmlns:app="http://schemas.android.com/apk/res-auto"
+        xmlns:tools="http://schemas.android.com/tools"
+        android:id="@+id/bottom_navigation"
+        tools:ignore="UnusedNavigation"
+        app:startDestination="@id/mainFragment">
+
+    <fragment
+            android:id="@+id/mainFragment"
+            android:name="com.seok.gitfordeveloper.views.MainFragment"
+            android:label="fragment_main"
+            tools:layout="@layout/fragment_main" />
+</navigation>
\ No newline at end of file
diff --git a/app/src/main/res/values/colors.xml b/app/src/main/res/values/colors.xml
index 3632c39..7b64d22 100644
--- a/app/src/main/res/values/colors.xml
+++ b/app/src/main/res/values/colors.xml
@@ -13,5 +13,5 @@
 
     <!-- APP UI Color -->
     <color name="colorTopBar">#444444</color>
-
+    <color name="iconText">#e4f9f5</color>
 </resources>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 9f7e8df..e24d5b7 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -7,6 +7,7 @@
     <string name="invalid_token">로그인 토큰 발급을 실패하였습니다\n다시 시도 해주세요</string>
     <string name="today_contribution">Today contribution : </string>
     <string name="max_contribution">Max contribution : </string>
+    <string name="navigation_menu_main">Main</string>
 
     <!-- Project String env -->
     <string name="no_token">Empty token</string>
@@ -26,4 +27,7 @@
     <string name="admob_app_id">ca-app-pub-2766237193476584~8461542866</string>
     <string name="banner_ad_unit_id">ca-app-pub-2766237193476584/5575239666</string>
     <string name="banner_ad_unit_id_for_test">ca-app-pub-3940256099942544/6300978111</string>
+
+    <!-- TODO: Remove or change this placeholder text -->
+    <string name="hello_blank_fragment">Hello blank fragment</string>
 </resources>