Learning theory at an early stage
What 'other things' are you talking about can you pls explain
Mj
"... I feel that the main reasons to buy an opening book are to give a good overview of the opening, and to explain general plans and ideas. ..." - GM John Nunn (2006)
"... Maybe this warning against the study of openings especially focuses on 'merely learning moves'. But almost all opening books and DVD's give ample attention to general plans and developing schemes, typical tactics, whole games, and so on. ..." - IM Willy Hendriks (2012)
Perhaps of interest:
https://www.chess.com/article/view/learning-an-opening-to-memorize-or-understand
IMO learning opening lines at an early age(not the physical age) is not advisable. I think one has to learn the principles and tactics like pins, skewers, forks,etc play many games then learn the openings. I made this mistake one of my friends taught me the opening lines soon after I learnt to move the pieces for many years I played mechanically without understanding the ideas behind the openings and I couldn't get favourable middle games.