Make sure and hide the results also (as they are not relevant and skew discussion potentially)

First, one should normally fold this combination in the SB to a CO open.

Second, it is generally speaking, it's hard to construct a leading range on board textures like this that generally favor the pre-flop raiser. That person will very likely have all of the best hands on this flop: QQ, TT, 99, KJs, KJo, QTs, QTo, T9s, and some T9o (plus AA, KK, AQs, AQo) in full combos whereas you will very often be 3-betting many of those pre-flop giving him a nut edge.

Your hand range will certainly include pair + draw combos, so usually you will be check-calling here quite a lot on this exact flop to try and realize your equity.

A lot of mistakes in my opinion, but they wouldn't change the outcome of the hand. Unless you know BB is passive I would only 3b preflop from the SB. Since this is 2nl probably a safe bet the BB is passive so a call probably isn't terrible. Why it is terrible is that you are likely to get squeezed by BB. I would have either 3bet this hand as bluff or folded it. Calling with this out of position to the entire table and you aren't closing preflop action is going to put you in some tough positions.

Flop, you get lucky and hit one of the best flops possible for this hand. I don't like the donk bet, but this is a spot I haven't studied in depth. I think villain is likely to cbet and I would elect to check raise so we get some additional value out of his air. After you value bet and are raised you are definitely looking to get all in on the flop unless you have some odd read, or are playing against the most passive 2nl player ever.

I would recommend either reading Clarke's "Grinder's Manual" or purchase the From the Ground Up Series" on this site. I personally think the book is better and takes its time explaining things better and that the videos are a bit too quick. Those will give you better fundamentals and this situation will look more like asking someone if 1+1 still equals 2. Don't take that as an insult as you shouldn't be afraid to post any questions here, just that after a little bit of reading and experience this situation is going to be routine.

Also, I recommend forgetting GTO. 2nl is loaded with Fish and GTO is going to adversely impact your win rate.

Before I considered anything other than a fold pre, I need to know precisely what my 3b success is vs CO in this spot. I think QJo would be the very bottom of my 3b range here (probably KQo due to how often they call). Simplify your strategy to 3b/fold facing a single raise and no callers. With callers, you can start to develop a call range but it needs to be hands that can flop robustly (decent, unsqueezed pairs, connectors and Ax suited come to mind).

As played, you probably fare better playing this as check/call. We are basically even $$$$$ vs his TP+ value range (25% vs his 2pr+) and also improve to the nuts when Ts fills his FD's. Turns will be easy to play (8 turns we can just x/f and most of the rest we can x/continue with.

Back to preflop, cutting stuff like this out of your ranges completely will have a huge impact long term. As you gain more experience and can think to yourself in a matter of seconds "OK, I know CO folds to 3b 31% of the time, I need to be pretty strong and solid here. What type player is BB? How often does he squeeze? 4%? 5%? I know the CO is going to defend roughly 7 times out of ten. What should my range look like? JJ+, AK, AQs, blocking/high equity preflop polarizers and one combo of junk? so like 7 combos that can continue, 3 combos that are easy folds vs 4b, 2 of the 3 combos we polarize with are in ok shape if they call my 3b and we see flop, one of the combos is a simple x/f on the flop unless we smack 2 pr on the right board?"

Now, look at the above hand and ask yourself, is QTo the combo I planned to x/f when I pick it as a preflop polarizing combo? Now I flopped kind of good but is this the type of board I want to have 2 pair on when money starts pouring in the pot? I think we can start shoveling $$$$ in potentially on like QT7 tt maybe, this is wrong board for it.