What is the best way to remember the rules of punctuation?
Practice and know the differences of AP vs Oxford rules.
Practically, AP style has developed a lot.
If you are not going to take the IELTS, I suggest you just follow AP as all media follow it around the world.
To be a good writer, you must practice them day by day, specially dash usage etc.
However, if you are not articulate of sentence fragmentations, sorry, punctuation rules will readily not be understandable by you.