chessGMA promotion puzzle is about getting a pawn to the last rank and turning it into a queen, or sometimes into a knight, rook or bishop. Look for the way to clear its path. There are 566 puzzles with this theme on chessGM. Every puzzle is rated, so the ones you get match your puzzle rating, and after solving one you can play through the whole solution on the board. It is free and needs no sign-up.