Marginal preflop situations hurting your winrate

Cold calling can be good, but nowhere near at the frequency you’re talking about.

You can have dynamics where you have a whale open/calling 100%, and you know you can get the stack if your speculative hand holds up. More of a live thing.

Problem is that you’re so ungodly capped as a result of cold calling that anyone with a brain can print against you.

Basically would never do it. Cold 4bet or fold.

Don't do it.

SB or BB? Those are 2 very different positions.
From SB you are supposed to 3bet a linear range (only good hands), QJo is hardly ever there except maybe from time to time vs BTN.
From BB you are supposed to 3bet a polar range, with premiums and some "trash" like Q4s, 54s etc... Unsuited broadways are part of the "trash". When we 3bet the trash we really hope to see a fold, and when we are called I believe we expect to lose money on average. But if we never 3bet the trash our opponents will notice we have a very low 3bet% and we never get action with our premiums.[/QUOTE]

1: I recommend a 4b or fold strategy. By cold calling, you are often playing a 3-way pot and out of position. You aren't even guaranteed to see a flop. You will be dominated often and you won't get to realise your equity because of multiway and oop (often at least).

Much better strategy would be a very tight 4-bet only range. Against regs with decent 3-b stats, widening this range to incldue some bluffs with blockers can become lucrative, especially in position (eg. mp open, co 3-bet, hero 4-bet on btn). However, make sure you know the 3-bettor is not a nit and preferably a somewhat 3-bet happy reg. When you do open up your range, just choose the second best (non premium) hands like AQs, AJs, KQs.

2: When we are on BB facing an open and several calls, our pot odds get better but our equity, and more importantly, our ability to realise equity, becomes much worse. THis means that we need to tighten up, not loosen up. Think about folding the weakest offsuit broadways and think about squeezing the stronger ones. You can still call all suited connectors and small pairs.

3: You can assume tight 4-bet ranges from your pool. There is nothing wrong with folding the 88 and AQo especially as you are OOP. My advice would be to follow their 3-bet%: if they are 3-bet happy, they are also more likely to have 4-bet bluffs in their range. If your opponent has like 3% 3-bet, just fold all non premiums vs. a 4-bet. Of course you can also follow people's 4-bet stats, but usually those take a larger sample of hands to show anything significant.

Pairs are overrated generally. 99 or TT look like nice hands but when someone 3bets JJ-AA and AJ AQ AK KQs KJs etc then what do you beat? You're either dominated or facing 2 suited overcards. You will save money folding in that spot.
Calling offsuit broadways from bb, well thats poker. You need to make more than -1bb on average by calling pre. Not every spot is a "nice" one. If you are 3betting them and struggling then stop 3betting them or study more about when you are supposed to barrel postflop etc

Those are good for getting a baseline, but why on earth would you want to be using an RNG vs. 5nl fish? Besides, it's good to understand the mechanisms here, and not just copy charts, so the questions posed are really good. In the real world you want to be deviating from gto ranges a lot.

In order to learn for when he'll move up (he was talking about tight regs not fishes).

Sure, you want to learn why you're supposed to do some things and how to deviate from that, I agree.
But you do need a baseline instead of just clicking buttons.

I think you should study GTO preflop ranges as your baseline, and adjust based on player tags and hud stats. If players are tighter, generally you want to be betting less. If they are folding to 3bets/4bets more often, then you want to 3bet/4bet them with a more polar range that includes hands like A5s that blocks some of the top of their call range and unblocks some of their folding range like AQo. If they are stickier, then you want to be retaising them with a more linear range and mainly skip out on the light cold 4bets with stuff like A5s.

As to you specific questions:

1. Generally don't cold call if a tight reg opens UTG and a tight reg 3b. 4b or fold. And honestly if they are actually tight, even JJ folding isn't bad imo, but it would probably be the bottom of the 4b range. AKo similar to JJ is probably a 4b or fold also. QQ+ and AKs would be pure 4b.

2. This is where you really need to study GTO preflop charts. Generally offsuit broadways are high frequency calls in the BB and low frequency 3b. But if villain underfolds to 3b, forget 3b these most of the time and go more linear like JJ+, AQo+, AJs+, KQs+, maybe a pip or two wider

3. Depends on player a 4b frequency. Again, study GTO ranges as your baseline and adjust from there. I like to look at their 4b range % in hud. In 6max I think a 2.6% 4b range is pretty tight and we should underdefend, consider folding hands like JJ, AQs. I'm not sure at what point it tips to us wanting to continue closer to GTO ranges, maybe around 3.6% 4b range +? It also depends on their position and sizing.

Another reason I think you should study GTO ranges - in scenario 3, you mentioned 3betting 88-JJ in the blinds. Yeah in SB doing a 3b or fold strat can be good, but more often than not in the BB we would want to flat hands like 99, 88. You may find that you are 3 betting the wrong mix of hands. Also, it is important to be looking at the right charts for the level of rake you have. At the micro stakes it is way more important to be 3betting hands that have an A or K in them from the BB. Hands like K2s are more likely to be 3bets from the BB at 25nl and lower rake while at 500nl hands like 65s are more likely to be 3bets.

Good luck!

Yeah it's good to learn and understand theory as part of your poker education of course, and part of that would be understanding roughly if something is a mix or a pure action in theory. I'm just saying that the reason why you would want to be using an rng would be that you know you are playing a tough opponent who knows how to adjust to you, and also has information on you already. And this is going to happen almost never at the lowest stakes, and even if you're playing like 200z or something, most opponents you will be playing against are pretty much unknowns, so you want to play exploitatively in most situations anyway.

Honestly I've been starting to treat solver and theory study as a sort of general understanding of the game but rarely following it. In real world situations, two (or more) options are rarely indifferent, so probably you don't need to mix that often. And if you're trying to mimic gto output already from low micros, using rngs etc, it's going to be a tough and even undoable journey working your way through the micro stakes.