I should probably code something but I don't know what to code.
btw it doesn't need to be useful to others, or even yourself, unless you think you've actually learned enough to try one of those. either way doing things that may be called "useless" or have no real end product, still always yield something invaluable: knowledge and experience. and i cannot stress that fact enough, even if you think you wont. trust me you will.
tldr just make anything, even basic tic tac toe game or a paperdave question search. (i'll probably try both of those at somepoint myself too)