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I want to know the difference between a blue folder and a yellow folder in Xcode.
I found this but doesn't clarify my doubts!
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Blue is used to represent a "Folder Reference".
It means they are not found on disk where your project believes they should be. Control-click and Show In Finder to see the folder location to locate the file and drag it back in to the project, and delete the bad reference.
The Project navigator displays your project's files and lets you open, add, delete, and rearrange those files. To open the Project navigator, at the top of your project window's navigator area, click the icon that resembles a file folder.
Yellow folders are "Groups", they are not actual folders but references to folders/files. They exist only to organize your project in Xcode. Blue folders are actual folders existent in the file system.
Blue folders give you the benefit of not having to "Add File" everytime something new lands in the folder i.e. an image. However, you should still mostly use groups (aka yellow folders) because it gives you more control on what will be bundled with your app (think of hidden files in the folder/versioning files). Also, sometimes blue folders can mess up your file hierarchy in your bundle, ie. causing the splash screen to malfunction. There are only a few cases where you would use blue folders, like a "content" folder, where anything in the folder should be packed with the bundle (as Mark Szymczyk commented, images or videos). If you're not sure, stick with yellow folders.
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