Congrats dude!

Hand #1: Meh, reads on his opening range would help, but I think you´re way behind his calling range on this flop. A check jam here is a waste of value.

Hand #2: Checking back a low coordinated flop 3way is fine. Thinking that others will float us oop to rep overs on later streets is not. When we cbet here we are the ones looking for high turn or rivercards to represent and double barell.

Hand #3: Flatting is bad, we can´t expect that many dominated Aces/Kings in either of those guys ranges, there´s the threat of UTG+1 4 betting. I don´t mind a fold.