Meons

Hero (SB): €3.07 (153.5 bb)
BB: €2.00 (100 bb)
UTG: €2.11 (105.5 bb)
CO: €1.11 (55.5 bb)
BTN: €1.92 (96 bb)

Hero posts SB €0.01, BB posts €0.02

Pre Flop: (pot: €0.03) Hero has Ks Ah
2 folds, BTN raises to €0.06, Hero raises to €0.24, fold, BTN calls €0.18

Flop #2: (€0.50, 2 players) 6h Ts Jh
Hero checks, BTN bets €0.26, Hero calls €0.26

Turn #2: (€1.02, 2 players) Js
Hero checks, BTN checks

River #2: (€1.02, 2 players) 8d
Hero checks, BTN bets €0.80, Hero folds

Results: €1.02 pot (€0.06 rake)
Final Board: 6h Ts Jh Js 8d

BTN wins €0.96

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Preflop I am good but then I feel I played poorly...
Is it ok to check call the flop? Would it have been better to bet or check raise? (with 2 overs, straight draw and backdoor flush draw I think so)
Is it ok to fold to a 80% pot size bet on the river after vilain checked the turn? When he checks this turn I feel he's very strong or has nothing; with draws he would have continued to bet and with this river a lot of draws have missed so maybe a call is fine? What do you think?

Thanks!