I have another problem to my game and it is about checkpoints

My game is not doing it. :( I have been trying many ways, but I got nothin. Can someone help me please. here is the game: https://microstudio.io/Tiberius/supermariobros/

Give the player a spawnpoint. When the player dies, position them at the spawnpoint. When they touch a checkpoint, set their spawnpoint to the position of the checkpoint.

hmmm. That is what I tried to that a long time ago. Can you give me code for the spawn point in the player. that would be nice. :)