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First off, I like this kind of thread idea. Many people don't take good notes, and when they do, they still fail to understand how to implement the notes they do take. They either don't adjust their ranges accordingly or do so incorrectly, which is obviously a bad thing.
QJs 5x open... You really can't read too much into this without more information. I supposed you can assume he understands the value of hands like suited connectors, and possibly has a wider than average range. Some questions to ask would be... Is 5x his standard opening size? Have you seen him vary his opening size based on hand strength, such as only 3xing AA?
Keep in mind there could be a fair amount of factors resulting in his 5x open. There could have been a limper/poster than you forgot to mention. There could have been an uber fish, in which case this guy was trying to build a pot. Etc. Kinda depends on the context of the rest of the situation.
I agree with XTR on the 77 hand.. Board texture is pretty important here to dive into any real conclusions. It's standard to call a cbet with 77 on say a 255 board, or other similar board textures, so him calling the flop without hitting a set doesn't tell us much. On the turn, I'm assuming you check/called, in which case (board texture is still important) we can come to some more conclusions.
When we see him calling the flop with marginal hands, and then willing to bet the turn with those marginal hands, we can make a few assumptions and adjust our ranges accordingly. We know his flop calling range isn't terrible strong (depending on board texture). Given this, and knowing whether he is willing to fold those hands to further action or not, we can make more accurate turn/river decisions.
Say he calls the flop with a fair amount of marginal hands, floats, etc, and is capable of folding to subsequent turn/river action. Well in that case, on the turn his range is somewhat wide. Therefore, we can increase the frequency with which we double barrel bluff, as the range that he is folding to a turn bluff likely makes the bluff +EV. This would be different than if he folded marginal hands on the flop, and didn't float. Then his turn range would be stronger, and therefore, less likely to fold, making a double barrel bluff less profitable.
When he bets those marginal hands on the turn when checked to (board texture relevant), we can decide that his turn betting range when checked to isn't incredibly strong either, and therefore also expand our turn check/calling range. We can take some of the marginal hands that we would normally c/f the turn with because he is expected to check back his mid pair, underpair type hands with, and instead check/call because he is betting those hands.
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