re: Poker & $10 NLHE Full Ring: 77 late with an Agg 3better
I think what you mean by "give villain the weakest range" is actually "how do we keep villain's range the widest". Clearly the best way to do that is to take the only line that doesn't shut any of his range out: flatting. That's not my preferred line for advice for micro players though since typically it's kind of tough to play postflop, and is definitely profitable to stack pre, so I tend to suggest just doing so.
Typically 4betting small to induce is going to keep his range wider than just shoving. There are guys who will 3bet 55, see a tiny 4bet, and think you only do that with the nuts, so they fold, but when you shove they look you up lighter, but they'd be the minority imo.