Can we use UnityStandardAssets in our published games? (Like for example the FPS Controller) Or is it only for Studying purposes .

Unity standard assets have made making games a lot easier for me for quite a while now. Can we use them in games that we intend to publish or in game jams?

You should read the license agreement of the standard assets. I don’t exactly remember what’s in there, but I think you can use it commercially. But don’t quote me on that.