I am a self taught pianist, I play mainly by ear and I look for tutorials or synthesia on YouTube. However, sometimes some pieces do not have a synthesia and are really subtle to play by ear (ex. Fides Tua by Tigran Hamasyan). This is why I want to learn how to read sheet music and I ask for your recommendations on how to do so.
My goal isn't to become a really fast sight reader or to understand every single detail on the sheet music, neither to be able to play a piece only by reading the sheet music (and not having listened to it prior to that). Instead I want to use my music reading skills to figure out how to play a piece after I have listened to it.
Also, I wish that you could also recommend me some techniques by which I can teach myself some good amount of music theory !