Hi guys. I am playing NL2 and the goal is to reach NL25 at some point (started this December and so far so good).
I played interesting hand and I put this into GTOWizard. I don't understand river action and why I should always bet top pair or higher.
PokerStars - $0.02 NL (6 max) - Holdem - 4 players
CO: 100.5 BB
BTN: 205.5 BB
Hero (SB): 114 BB
BB: 136 BB

Hero posts SB 0.5 BB, BB posts BB 1 BB

Pre Flop: (pot: 1.5 BB) Hero has Jh Ad
fold, BTN raises to 3 BB, Hero raises to 11 BB, fold, BTN calls 8 BB

Flop : (23 BB, 2 players) 7c 8s Ah
Hero checks, BTN bets 5 BB, Hero calls 5 BB

Turn : (33 BB, 2 players) Qs
Hero checks, BTN bets 7 BB, Hero calls 7 BB

River : (47 BB, 2 players) Th
Hero checks, BTN bets 45.5 BB, ???

Please explain it to me very detailed because I am not familiar with advanced concepts.
As played should it be call?