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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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.
Piece play
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1819
Not every pin is effective
A pin the opponent can undo with a useful move is no pin at all. Judge a pin by what it holds and for how long.
Strategy
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1819
Convert an extra piece by attacking, not only by trading
A piece ahead, you can win by trading down or by using the extra piece in an attack on the king; attacking is often quicker.
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Far ahead, a pawn is currency
When far ahead, a pawn is something to spend, for example on a trade that simplifies. Do not cling to every pawn.
Attack
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19
The queen leads the battery
In a queen-and-bishop battery aimed at the king, put the queen in front: the queen at the head threatens mate.