Hip-hop's defining trait isn't the kick pattern or the snare placement — those are surface details that vary from producer to producer. The defining trait is the pocket: a deep, consistent time-feel where the drummer plays behind the click for the entire song. Not "behind for emphasis." Not "behind on the chorus." Behind from bar one to the fade-out, by exactly the same amount, every single time.
Pocket is what separates a drummer who has learned the boom-bap pattern from a drummer who plays hip-hop. The pattern in this lesson is the same pattern you learned in hiphop-boom-bap. The difference is that here we treat the time-feel as the lesson — three exercises, identical notes, three different placements — and you can hear what each placement does to the music.
"Behind the click" is usually 20–40 milliseconds late at boom-bap tempos. At ♩=88 a 16th note is about 170ms; the drummer's snare lands maybe a fifth of a 16th-note late. That's small enough that it doesn't sound wrong — it just sounds thicker, more relaxed, more grown-up. The hi-hat doesn't drag with the snare; only the snare drags. That tension between hi-hat (on the click) and snare (behind it) is the entire feel.
You can't see this on the page. The notation in all three exercises below is identical. The lesson is in the seat — what you do to the snare's placement after you read the notation.
Set the metronome to ♩=88 and loop each exercise for two minutes. Don't switch back and forth between "on" and "behind" inside a single take — your ear will get confused. Pick one feel, hold it for the full two minutes, then take a break before changing feel. The sensation you're after on the "behind" exercises is that the snare and the click are in conversation — the click goes first, the snare answers a moment later.