Hi w34z3l,
got some more hands for you 
1) definitely a mistake to fold this hand on river with missed fd and lot of weakness of my side by checking twice.
Although I think my play preflop is fine, I hate to play 4bet pots AJo OOP
PokerStars - $0.50 NL FAST (6 max) - Holdem - 6 players
Hand converted by PokerTracker 4
BTN: 100 BB (VPIP: 24.00, PFR: 20.00, 3Bet Preflop: 15.63, Hands: 76)
SB: 92.72 BB (VPIP: 10.00, PFR: 5.00, 3Bet Preflop: 3.23, Hands: 61)
BB: 100.42 BB
UTG: 233.2 BB (VPIP: 0.00, PFR: 0.00, 3Bet Preflop: 0.00, Hands: 2)
Hero (MP): 109 BB
CO: 128.04 BB (VPIP: 25.22, PFR: 20.02, 3Bet Preflop: 9.66, Hands: 832)
SB posts SB 0.5 BB, BB posts BB 1 BB
Pre Flop: (pot: 1.5 BB) Hero has A♠ J♦
fold, Hero raises to 3 BB, CO raises to 10 BB, fold, fold, fold, Hero raises to 23 BB, CO calls 13 BB
Flop: (47.5 BB, 2 players) 2♣ A♦ 7♣
Hero checks, CO checks
Turn: (47.5 BB, 2 players) 4♠
Hero checks, CO bets 22 BB, Hero calls 22 BB
River: (91.5 BB, 2 players) 6♦
Hero checks, CO bets 83.04 BB and is all-in, fold
Spoiler
CO wins 87.5 BB
2) Villain is quite aggro, so I let him do the betting for me
I mix it up with this holding on such boards. Sometimes x/c, sometimes bet myself and when lower stacked I like x/r turn on this board. I wonder if there is any theory about most optimal line on which boards, but I guess I played it fine given the board
PokerStars - $0.50 NL FAST (6 max) - Holdem - 6 players
Hand converted by PokerTracker 4
BTN: 299.42 BB (VPIP: 27.01, PFR: 18.56, 3Bet Preflop: 10.63, Hands: 492)
Hero (SB): 203.84 BB
BB: 72.6 BB (VPIP: 32.52, PFR: 14.63, 3Bet Preflop: 7.02, Hands: 128)
UTG: 120.54 BB (VPIP: 24.64, PFR: 17.57, 3Bet Preflop: 5.38, Hands: 938)
MP: 183.84 BB (VPIP: 22.69, PFR: 17.21, 3Bet Preflop: 6.23, Hands: 1,568)
CO: 108 BB (VPIP: 30.77, PFR: 24.23, 3Bet Preflop: 10.92, Hands: 264)
Hero posts SB 0.5 BB, BB posts BB 1 BB
Pre Flop: (pot: 1.5 BB) Hero has K♦ K♠
fold, MP raises to 3 BB, fold, fold, Hero raises to 10 BB, fold, MP calls 7 BB
Flop: (21 BB, 2 players) Q♠ T♣ 3♦
Hero checks, MP bets 9.98 BB, Hero calls 9.98 BB
Turn: (40.96 BB, 2 players) 7♠
Hero checks, MP bets 26 BB, Hero calls 26 BB
River: (92.96 BB, 2 players) 2♠
Hero checks, MP bets 137.86 BB and is all-in, Hero calls 137.86 BB
Spoiler
MP shows 8♥ 6♥ (High Card, Queen)
(Pre 21%, Flop 3%, Turn 9%)
Hero shows K♦ K♠ (One Pair, Kings)
(Pre 79%, Flop 97%, Turn 91%)
Hero wins 364.68 BB
3) Brag hand
I think I played this good. We have position and backdoors to bet turn. We hit our fd draw and the A is good card to bet again. On river its again a clear bet. Although he had pot left, I decided to half pot, because I dont see him folding more hands when I would shove, so I go for the lowest bluff price on this board
PokerStars - $0.50 NL FAST (6 max) - Holdem - 6 players
Hand converted by PokerTracker 4
Hero (BTN): 212.9 BB
SB: 66.76 BB (VPIP: 30.77, PFR: 15.38, 3Bet Preflop: 0.00, Hands: 26)
BB: 73.68 BB (VPIP: 33.33, PFR: 33.33, 3Bet Preflop: 0.00, Hands: 3)
UTG: 124.06 BB (VPIP: 18.42, PFR: 15.79, 3Bet Preflop: 0.00, Hands: 41)
MP: 182.48 BB (VPIP: 25.52, PFR: 20.29, 3Bet Preflop: 9.79, Hands: 846)
CO: 117.2 BB (VPIP: 100.00, PFR: 0.00, 3Bet Preflop: 0.00, Hands: 2)
SB posts SB 0.5 BB, BB posts BB 1 BB
Pre Flop: (pot: 1.5 BB) Hero has T♥ 9♥
fold, MP raises to 2.22 BB, CO calls 2.22 BB, Hero calls 2.22 BB, SB calls 1.72 BB, BB calls 1.22 BB
Flop: (11.1 BB, 5 players) 7♣ 4♠ 5♥
SB checks, BB checks, MP checks, CO checks, Hero bets 6 BB, SB calls 6 BB, fold, fold, fold
Turn: (23.1 BB, 2 players) A♥
SB checks, Hero bets 13 BB, SB calls 13 BB
River: (49.1 BB, 2 players) Q♠
SB checks, Hero bets 23.78 BB, fold
Spoiler
Hero wins 46.64 BB
4) Shitty flop, so no bet. Turn we hit our 4 and I decided to lowbet it to protect and maybe get value of some weak draws or AQ+ he cant fold. His raise makes it very awkward for me, but guess my play is fine? 
PokerStars - $0.50 NL FAST (6 max) - Holdem - 6 players
Hand converted by PokerTracker 4
BTN: 100 BB (VPIP: 24.83, PFR: 18.88, 3Bet Preflop: 7.50, Hands: 290)
SB: 105.4 BB
BB: 30.88 BB (VPIP: 13.33, PFR: 0.00, 3Bet Preflop: 0.00, Hands: 15)
UTG: 95.72 BB (VPIP: 9.30, PFR: 4.65, 3Bet Preflop: 0.00, Hands: 43)
Hero (MP): 169.34 BB
CO: 183.52 BB (VPIP: 34.00, PFR: 26.00, 3Bet Preflop: 6.25, Hands: 52)
SB posts SB 0.5 BB, BB posts BB 1 BB
Pre Flop: (pot: 1.5 BB) Hero has A♣ 4♣
UTG raises to 3 BB, Hero raises to 9 BB, fold, fold, fold, fold, UTG calls 6 BB
Flop: (19.5 BB, 2 players) 9♦ J♥ 5♠
UTG checks, Hero checks
Turn: (19.5 BB, 2 players) 4♥
UTG checks, Hero bets 6.66 BB, UTG raises to 24.16 BB, fold
Spoiler
UTG wins 31.18 BB