AP CSP Create Task Ideas?

i am so stumped on what to make for the computer science principles create task. i thought about doing a gpa calculator or a tic tax toe game like everyone else, but i don’t know how that could possibly check all the requirements. my understanding is that we must include a list, a function with a parameter, and a loop and if statement inside that function. but i’m also unclear on what EXACTLY sequencing, selection, and iteration means. any help is so appreciated