You need a few dependable habits before you need a large opening repertoire. Learn to identify attacks, count defenders, and check whether your king can safely castle. Then connect those calculations to three broad aims: influence the centre, develop useful pieces, and keep the king secure. These aims explain most natural opening moves, although a concrete threat can take priority over any rule.
Reading notation lets you follow a lesson accurately. Recognising move orders lets you notice when a familiar position has been reached by a different route. Both skills matter because a move that works after castling may fail when your king is still on e1. Looking only at an opening's name can hide that difference.
Next, study a small number of pawn structures. In an open centre, development and exposed kings often demand immediate calculation. A locked centre may give you time to reposition a knight or prepare a pawn break. The diagram shows an Italian setup with central contact still unresolved; deciding when to play d4 requires checking Black's replies, not simply remembering that central pawns are good.
Work through the essentials in a practical order: principles, notation, traps, structures, then middlegame plans. After each lesson, play a relevant line and explain one decision aloud. When you make a mistake, ask whether you missed a threat, misunderstood a plan, or forgot the move order. Each cause calls for a different kind of practice.
Try this at the board
Count the developed minor pieces in the diagram. Which legal move would improve White's king safety?