best way to Learn openings

Use chessable. Tons of free courses and helpful for introducing mainline ideas and fundamentals. You can also just poke around in the lichess database for new moves that are interesting.

Play correspondence and vote Chess.

Learning the purpose behind moves is much more important than memorizing. Usually the purpose is connected to chess opening principles, so at the lower ratings (especially 1200 or lower rating), you can get by on just learning chess opening principles and putting little to no emphasis on memorizing opening theory. 

It isn't that they go against each other (because they don't), it is just that those very chess opening principles are the foundation for those mainlines worth memorizing in the future. It makes sense to learn those basics and the "why" behind the moves first:

https://www.chess.com/blog/KeSetoKaiba/opening-principles-again 

Do not learn openings, just play and learn from your losses.

Chess Openings Resources for Beginners and Beyond...

https://www.chess.com/blog/RussBell/openings-resources-for-beginners-and-beyond

https://www.chess.com/blog/RussBell

learn the ideas behind each move. Also make sure to look at GM games and play practice games and analyse

Use chesspractice.com.  You can do what ifs to explore good and bad lines

I think if u first learn the pawn structures of the openings ur interested in it'll provide a map and make memorization easier because u learn the overall strategy/goals thereby making understanding the why of individual moves easier to grasp.