Level 1: The Board; the Pieces and their values; Check, Checkmate and Stalemate; Castling; Illegal Moves.
Level 2: Notation; Annotation symbols; Checking and Checkmating; Sacrifices; Stalemate; Forks, Pins and Skewers; Doubling Up; the 7th Rank; Overloading; Opening Principles; Attacking and Defending Pieces; Tournament Chess.
Level 3: From this point, topics are covered in much greater detail. Basic Endgame concepts; Combinations; Tactical ideas; some e4 and d4 Opening theory; more on Attacking and Defending.
Level 4: Advanced Endgame Concepts; more Tactics; Positional concepts; more Opening theory.
Level 5: Advanced Opening and Middlegame Themes; Advanced Endgame Theory involving Combinations of Pieces; Psychology.