So, you may have looked at stuff and seen “F4F”, advertising projects on a famous project (that is something even I don't understand).
Since this is for New Scratchers, here is an explanation: F4F, means Follow For Follow (it gets pretty annoying, because it means that if they follow you, you follow them… who made it? I don't know), now for Remixing, that is for using the other project as a tutorial, or a way to collaborate, but most New Scratchers just Remix it, and just put their name in it and remove the Original Creator's name and call it theirs. (Which Breaks The Community Guidelines, Under ‘Exact Copy’, and can get reported, and just don't remix a project to make it yours, do it to Learn! Collaborate! And More!