When Should I Have Folded or Not

I am new and this is my first hand so go easy. lol
Based on a few hand histories I reviewed MP1 seemed to play anything from anywhere.

Thanks for the help, AG

PokerStars 0.05/0.10 Hold'em (7 handed) converter

Preflop: Hero is UTG with Q[img]/images/graemlins/club.gif[/img], J[img]/images/graemlins/heart.gif[/img].
Hero calls, MP1 calls, <font color="#666666">3 folds</font>, SB completes, BB checks.

Flop: (4 SB) Q[img]/images/graemlins/heart.gif[/img], 8[img]/images/graemlins/diamond.gif[/img], K[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(4 players)</font>
SB checks, BB checks, <font color="#CC3333">Hero bets</font>, <font color="#CC3333">MP1 raises</font>, SB folds, BB folds, Hero calls.

Turn: (4 BB) T[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>, <font color="#CC3333">MP1 raises</font>, Hero calls.

River: (8 BB) 9[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">MP1 bets</font>, <font color="#CC3333">Hero raises</font>, <font color="#CC3333">MP1 3-bets</font>, <font color="#CC3333">Hero caps</font>, MP1 calls.

Final Pot: 16 BB

Results in white below: <font color="#FFFFFF">
Hero has Qc Jh (straight, king high).
MP1 has Jc As (straight, ace high).
Outcome: MP1 wins 16 BB. </font>