So here’s my question. Should I learn one opening really well or several openings good enough?
Unless you have an excellent memory and near perfect recall, learn one opening as white and one for black against e4 and one against d4.
You should primarily learn the ideas in the chosen opening and not necessarily the move orders and lines since the vast majority of games are going to deviate from anything you study within 6-8 moves in most games. Study your games after to look for any opening errors and you should be able to grow your depth through that.
So here’s my question. Should I learn one opening really well or several openings good enough?