A while ago, I tried to start a petition to get a new forum page specifically dedicated to openings (it did not go well). Needless to say, I feel that this is a very broad topic.
Regarding sources, it depends on how in-depth you want to go.
What specific openings do you want to look into?
Regarding sources, it depends on how in-depth you want to go.
What specific openings do you want to look into?