Ah, Peach Vs Marth. Dont we hate this guy so much? With his Sword and cheap kills. You did well here against him. Now for your advice:
1:26: You could have throw the turnip the other way so you could have faced the stage and then grab the edge easy. Marth would have falling to his demise. This is a quick was to grab the edge. So do this alot for when you need to grab the edge fast.
2:23: NICE!!!! Way to think. Good show right there. do things like this alot, dont always go in. keep them guessing and have them scared. and you will have the upper hand. but good job here.
Overall: you did well Nice use of the turnips and aim. But you seem to at times DI into Marths attacks, dont be so eager to get a hit in. Also You Fsmash to much. and its not good as an edge guard. If Done right, you can FC to a Dair to a Nair. And you need to tone down the dash attacks. you do it too much. Get some grabs in there. You would have won the match if you had grabbed him instead of Dash attacking. other than that, Good job here. just work on what I said here.