Things to note when committing your Unity Project to GIT

In your Unity Project:

1. Go to Edit > Project Settings > Editor.
2. Set Version Control Mode as Visible Meta Files. 
3. Set Asset Serialization Mode as Force Text.
   

In your GIT Project:

1. Set .gitignore

   obj Temp *.tmproj *.csproj *.unityproj *.sln *.suo *.user *.pidb *.userprefs Library/cache/* Library/metadata/* Library/previews/* Library/ScriptAssemblies/* .DS_Store Library/* Library/AssetImportState Library/AssetServerCacheV3 Library/FailedAssetImports.txt Library/ScriptMapper Library/asetDatabase3 Library/cache Library/expandedItems Library/guidmapper AnnotationManager assetDatabase3 AssetImportState assetservercachev3 AssetServerCacheV3 AssetVersioning.db AudioManager.asset BuildPlayer.prefs BuildSettings.asset DynamicsManager.asset EditorSettings.asset EditorUserBuildSettings.asset expandedItems FailedAssetImports.txt guidmapper InspectorExpandedItems.asset MonoManager.asset NetworkManager.asset ScriptMapper

2. If you’re using SourceTree, go to Settings > Advanced > Repository-specific ignore list > Edit.

Then you’re good to go! 🙂

Yeti Crab also wrote a good tutorial on how to use GIT with Unity without using command line (they used SourceTree and BitBucket).