Step 1: e4. e4 has a very high chance of winning, and the best choice for the opponent is to do e5.
Step 2: Nf3. Your opponent will have a high chance of Nc6 to “defend” the e5 pawn.
Step 3: Bc4. Bc4 is not only going to let you castle next turn, the bishop will also going to point at the f6 pawn and soon checkmate the opponent.
Step 3.5: If you don’t have any hanging pieces in danger, skip to step 4. Move your piece in danger to a safe space.
Step 4: Castle by moving your king to g1 and your kingside rook (the rook on h1) to f1.
#Note: You CANNOT castle while in, through, or into check, but you CAN castle when your rook is in danger to save your rook. DON’T castle when your rook will move into danger after castling
The notation of castling kingside is O-O, while castling queenside is O-O-O