just finished my first session at 5NL and played 70 hands with final stats at 14/11/7. Was slightly up til the last hand .Followed the guide with regards to bet sizing up to the river . I'm wondering whether i should have called his river raise,have checked on the riverand folded to a significant bet from him as he may have made the straight or just raised him enough to put him all in if he called.
villain was 32/3/.13 over 28 hands and i'd seen him showdown with 77 and 55

PokerStars No-Limit Hold'em, $0.05 BB (9 handed) - Poker-Stars Converter Tool from FlopTurnRiver.com

MP2 ($5)
MP3 ($3.13)
CO ($6.32)
Button ($10.17)
SB ($20.79)
BB ($1.54)
UTG ($10.44)
Hero (UTG+1) ($5.09)
MP1 ($5)

Preflop: Hero is UTG+1 with K, A
UTG calls $0.05, Hero raises to $0.20, 2 folds, MP3 calls $0.20, 4 folds, UTG calls $0.15

Flop: ($0.67) K, 6, 8 (3 players)
UTG checks, Hero bets $0.40, MP3 calls $0.40, 1 fold

Turn: ($1.47) 10 (2 players)
Hero bets $1.05, MP3 calls $1.05

River: ($3.57) 7 (2 players)
Hero bets $1.10, MP3 raises to $1.48 (All-In), Hero calls $0.38

Total pot: $6.53 | Rake: $0.30