Background: I'm just getting back into poker after a long break. Last year I worked my roll up from 10nl to 50nl but was forced to cash-out due to forces out of my control. I did leave $280 on FTP (in case I wasn't able to deposit) and I'm trying to start good habits.

Hand 1: Full Tilt No-Limit Hold'em, $0.10 BB (8 handed)

UTG+1 ($8.95)
MP1 ($10.60)
MP2 ($8.20)
CO ($9.95)
Hero ($10.80)
SB ($9.15)
BB ($3)
UTG ($4.90)

Reads: I have seen SB bet aggressively when on the draw with 1 card to come.

Preflop: Hero is Button with , .
5 folds, Hero raises to $0.35, SB calls $0.30, 1 fold.

Flop: ($0.80) , , (2 players)
SB bets $0.8, Hero raises to $2.3, SB calls $1.50.

Turn: ($5.40) (2 players)
SB bets $5.4, Hero raises to $8.15 (All-In), SB calls $1.10 (All-In).

River: ($18.40) (2 players, 2 all-in)

Final Pot: $18.40



Hand 2: Full Tilt No-Limit Hold'em, $0.10 BB (9 handed)

MP2 ($10.80)
MP3 ($8)
CO ($4.20)
Button ($6.40)
SB ($5.30)
Hero ($21.35)
UTG ($0.30)
UTG+1 ($1.90)
MP1 ($13.05)

Preflop: Hero is BB with , .
UTG raises to $0.3 (All-In), 1 fold, MP1 calls $0.30, 5 folds, Hero calls $0.20.

Flop: ($1.00) , , (3 players, 1 all-in)
Hero checks, MP1 bets $0.5, Hero calls $0.50.

Turn: ($2.00) (3 players, 1 all-in)
Hero checks, MP1 bets $1, Hero raises to $3.5, MP1 calls $2.50.

River: ($9.00) (3 players, 1 all-in)
Hero bets $4, MP1 calls $4.

Final Pot: $16.95

I am posting these hands because I was confused about what was going on and made a gut decision/guess

Any analysis would be appreciated:
1.) What did the opponent have?
2.) What did I do wrong/right?
3.) What would you have done?