2NLz is harder than ring, but still super beatable.
Here were my 2NLz 6-Max RFI ranges (all 2.5-3x)
LJ - 87s+, KJo+,QJo+, Q10s+, 22+, A5s+
MP- 65s+, Q10o+, A9o+, J9s+, A2s+, 22+
BTN - 45s+, 109o+, 57s+, A2o+, K8o+, Q9o+, J9o+, 109o+, 22+
3Bet Ranges - JJ+, AQs+, 67s,78s,A5s (I polarized my 3bet range to avoid tight players exploiting me by just folding too often)
My calling range is one notch tighter than my RFI range to protect myself since I never have JJ,QQ,AK,AQs in my calling range.
Facing a 3bet at 2NLz I was extremely tight because so few people in that pool polarize their 3bets. You can exploit that player pool by playing super tight vs 3bets. Folding AJo, JTs. In a tough game I'd never fold JTs to a good player's 3bet.
Post flop 2NL -
You can use all your OESDs as 3 barrell bluffs in conjunction with your nut hands.
You should use your weakest flush draws as bluffs as well.
Weak gutshots are OK to checkraise barrell with too.
I had a very low cbet% (38%) to exploit the noobs with 75+% cbets. So id cbet top pair+, and strong draws.
I check all other hands.
NEVER DONK BET.