You are right, if it sounds good, it is good. But cannot trust my ears to much yet, because a lot I create, sounds good to me. This is because I am new at this. So I first need rules to give me some structure.

Done some more research and Beatles are indeed complicated. Got it now. It is not because I can do whatever I want, as I thought looking at this song, but Paul and Ringo are on a higher level which I cannot understand yet. So I have to stick to the basic rules with chord progression.

I have this book of Michael Hewitt, but no time to read it yet. He has more good books. For future study, just ordered a book with analyzing the Beatles songs. Same for Abba. These groups have something that makes their songs catchy and sticky.