Gridmap help needed

Godot Version

4.3

Question

Im trying to use a grid map in my 2.5ish game and my character just phases though the tiles
I would upload images but i cant

Sounds like a collision issue but would need a lot more info to try to help figure it out.

Have you tried watching Godot 4 Gridmap tutorials on youtube? I am sure watching some tutorials will help you figure it out.

i watched one but i did what it showed but i did change what colison shape setting
( i used sibling and trimesh)
is that the problem here?
Screenshot (15)
This is the tree i used