Not bad for only having played for a month.
Up through move 12: he getsinfluence, you get territory. I'm not sure which is better here, but note that his influence dominates 2/3 of the board.
13: So it is probably unwise to play in that corner right now. K4 or D5 might be safer.
16: He goes the wrong way
21: If R2 was not important enough to you to protect it last move, it isn't important enough this move.
29: R7
31: What is he threatening? A ko for a couple of points? Play D5
33: Again, this is small stuff. You are alive in the corner, so it does almost nothing for you.
34: ...but he doesn't realize that...
35: Much better! Grab the big points early. ( D5 might be even better, but yours is good. )
41: You are reverting to small moves. Note that the lower middle of the board is almost surrounded. Something like K5 would be useful now, or maybe G9.
45: Not a good habit on the fourth rank. It works on the second ( known as a 'watari' BTW ) and sometimes on the 3rd rank. But you are too easily split here.
57: He should play H16 here
61: Too thin. It sets you up for a double attack. You do not have to kill him. Just play F17 here, which threatens to kill him. He lives small, with maybe four points, while you build a wall to help secure 20+ points on the left side in conjunction with your D10/D9 stones.
73: Right idea, just a tad slow.
74: He misses it???
85: Finally, you saw it before he did.
89: Good style, but small. It kills two stones.
91: What does this do? You are alive with G1 any time that you want to be. The stones that need help are C16/D16. Try D14 or B16.
93: Good shape
97: The problem with F15 is not the ladder ( look closely again and you will see that you have a ladder-breaker ) but the possible death of C16/D16/E16.
105: E11 works better.
123: What is he threatening?
138: Those three stones are not going anyplace. You can kill them later. S18 is big. It steals eye space that he may need
143: Your best chance is probably T18. It goes for eye space. But it is probably not possible to kill because M19 or M18 is a free move for him.
148: He doesn't need to capture them now. Where would they go? He goes for the corner - the easiest place to make eyes.
151: This works only because your opponent is a moron.
155: Good
158: This threatens to turn a 1 eye group int a 1.5 eye group.
159: You can ignore it. If he takes, then next move you play T15 and he is still dead - and you got a free move somewhere else.
161: Small. You're saving 2 points here. In gote. But much of the lower half of the board is still undecided.
163: That was another 2 points in gote.
167: YES!!! Go for the big points!
225: Play A17 first. Then you get 2 ko threats out of it.
And C15 would have been a fine threat regardless.