Here is a platformer template you can use when making platformers. All you need to do is backpack the sprites, add some more costumes to your liking, then voila, the platformer is made. All the code is already done.
Please give some credit to me @hilty123 if you do use this, THANKS! ps: i got a bit of code from FUNUT's tutorials. WHY U DOWN HERE, GET BACK UP TO THE INTERESTING STUFF!