Castling queenside usually occurs when the rook will be well-placed on the d file, and indeed the need for it to be placed there is often the prime reason for adopting long castling. Vladimir Vuković, The Art Of Attack In Chess
The Stonewall Attack is always good if Black has shut in his c bishop by ...e6. Cecil Purdy, CJS Purdy's Fine Art Of Chess Annotation And Other Thoughts - Volume Three
In the ending of queen and pawn versus queen the best pawn to have is a centre pawn or BP; then comes the NP, and worst of all is the RP. David Hooper, Practical Chess Endgames
Use your computer as a training partner, if you do not have access to a trainer or regular sparring partner. Steve Giddins, How To Build Your Chess Opening Repertoire
Attacking chess will normally involve tactics at some point. Tactics by their nature usually involve checks or captures. So the most important things to watch for are checks and captures. Simon Williams, Improve Your Attacking Chess
To create a passed pawn from a pawn-majority it is best to begin by advancing the pawn which has no enemy pawn in front of it. Luděk Pachman, Complete Chess Strategy 2: Pawn-Play And The Centre