Match 1: Ok well I know you don't like to read my long post so I'll give you bullet points.
* Some of your wavedashes are a little too short. Practice making them a lot longer.
* Between 00:38 - 00:41 you failed to sweet spot both your Up/Side B. I'd practicie sweet spotting your recoveries, especially your Up B because there are so many possible angels.
* Your waveshining can use a lot of work. Although, you aren't bad for a couple of weeks.
*You have a habit of teching to the right. Learn to switch it up.
*Aerial to waveshine doesn't work on Luigi. The shine pushes him too far away.
* Be careful when using uairs on Luigi. He can easily out prioritize you with his nair.
Match 3:
* Never...ever use standing laser. Practice short hop laser. Learning short hop double laser couldn't hurt either.
* at 00:09 you get thrown of the edge and you jump back. Don't jump back. Simply continue to fall and use your second jump to grab the edge.
* You need to slow down and think. You are missing a lot of easy kills in the match. A perfect example is 00:53.
* You do a lot of unnecessary jumping. To make matters worse, you are full jumping. This habit will get you killed against better players. Try and stay grounded more. Empty short hops are ok.
* At 1:33 you chose a bad angle to Fire Fox. When using Fire Fox, you can either do it straight up and then fast fall to grab the edge, or you could aim it at the stage and curve it in order to sweet spot. Basically, never aim it at your foe.
* At 1:40 your enemy double jumps and he is at high percent. Instead of staying underneath Sheik and apply pressure you run away. Remember, you want to be underneath Sheik. She doesn't have much options to escape your uair.
Overall you aren't bad for a few weeks. Just work on those points I mentioned. Keep up the good work. XD