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where can i find chess theory for openings?

Chessable has several free opening courses.

Alternatively, you could create a lichess study and use the master's database in the opening explorer.

I'd definitely recommend looking at games played between masters if you're looking to get in-depth information though. Chessgames.com has a huge database which you can access for free. There is a limit to how deep you can go before searching for games without a premium account though.
Do not worry about opening theory
"In order to improve your game, you must study the endgame before everything else. For whereas the endings can be studied and mastered by themselves, the middle game and opening must be studied in relation to the end game." - Capablanca

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