The 3-bet range hardens to QQ+/AKs; everything else that continues wants to see five cards as cheaply as possible.
The 3-bet range condenses toward hands that welcome a giant pot; almost everything else that plays well flats. Bloated pots with dominated hands are how 500bb stacks vanish.
The most common confrontation in live poker: button steal, big blind close. Defend wide — but depth decides which half of wide.
Assumes a ~4bb open; 3-bet to ~3x the open in position, ~4x from the blinds — larger as stacks deepen.