Hello and welcome to the forum.
Simple requirements are usually the easiest to understand but also are the easiest to get wrong. Part of the problem is that the real world often looks simple but turns out to not be. The economics of programming is such that your biggest return on investment is a thorough examination of your requirements, maybe to the point of being slightly OCD about that examination. Look for the "gotcha" cases in that study so that they don't force you into retro-fitting something you thought was a better invention than sliced bread but turns out to be a source of green penicillin mold.