Most problems are already solved, but unfortunately, in this context "solved" does not mean "you do not have to worry about it anymore". Instead it means "here

Most problems are already solved, but unfortunately, in this context "solved" does not mean "you do not have to worry about it anymore". Instead it means "here are three or five industry-standard solutions, each of them working differently, each of them bringing different problems, you need to study how to use them, but some of the important things you will only learn from experience; by the way, five years later most of this will be obsolete". The application you are making is built on ten or twenty "solutions" of this kind.