Themes
Each number is a game; it opens the move where he explains the idea. Open a theme to read what it is about.
General
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The method of comparison, in both directions
A move is right or wrong for a reason. Compare it with a position where it was the other way round, and the reason shows.
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Ask what he is actually threatening
Before defending, ask whether the threat is real and what exactly it threatens. Often the answer is less than it looks.
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Be obsessed with undefended pieces
Make it a habit to notice every undefended piece, yours and his, and to count the defenders of every piece that is under attack.
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Make one move do two jobs
When a task can be done in a way that also does something else, do it that way. Do not tie a piece to one job if another can do it and keep working.
Pawn structure
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0111
Doubled pawns are judged by what they do, not how they look
Judge doubled pawns by their jobs: what they control, what they shelter, and what the trade that made them gave you.
Piece play
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A square can be a route rather than a destination
A square can be worth going to for where it leads next, not for what the piece does there.
Strategy
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A piece up, convert by improving
A piece ahead, finish developing rather than hunting for more material, and look for the trade that turns the advantage into a win.
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1120
The king can be tucked away without castling
The king can sometimes be made safe by walking it a square or two, keeping the rook where castling would have taken it away.