The quickest way to learn what you need to know is to start building. Then there will be something you need to know to keep going and you learn that and keep going until the next thing you need to know and you learn that...and so on.

Sure later you might face something you need to know and wish you had known earlier because now you need to redo a part or all of your earlier work. That is unavoidable. Doing things wrong is what "learning" means.