Here's a Jeff Van Gundy basketball defensive video and some annotations. Let's face it...this isn't material that everyone will want to study.
Load to the ball - get numbers to the ball side
His bigs hedge the high ball screen - no ICE for them
Great shots of the post position battle (transition D comes early)
"Kick smalls out" challenge the perimeter early
No middle/no paint
Dead dribble defender forces toward baseline
Closeout technique (high hands)
Scoring area 'trace the ball'
Notes they will defend some players differently (where they force them)
"Show your hands" to avoid fouls
They emphasize denial on wing to post entry (often dig at post if entered)
Contest everything (but don't foul)
"Hip to hip" to deny 'duck in' passes (use the body)
Influence post player to baseline (Kevin Eastman's 'homeless' position)
No gap splitting
Bigs need to recognize EARLY and react to BLOW BYS (drives)
"Sink and Fill" when smalls double team, must be physical and help rotates
Dig and recover- perimeter players drop and harass the post (on the DRIBBLE)
Dig and attack turnarounds from behind
Pick-and-roll D (he calls it DOWN not ICE)
Spread pick and roll high, try to keep dribbler from using the pick
Calls double team PnR "Blitz" recover to man if pass weakside
On "Blitz" have to rotate to keep action from the paint
"Blitz" high ball screen force "lob" pass
"Blitz" high ball screen good roll, big must step up
"Show" (fake trap) and go under against some (non-shooters)
"Stunt" to popper on pick-and-pop
Sometimes dead fronts in post (scouting report dependent) - obviously ball pressure needed
Uses different colors to define defensive actions...for example 'WHITE' traps post from oppos wing
I'll leave the rest to you like "War" to defend Hawk and UCLA cuts.