Help with colliders

Hi,
I’m very new to Unity, and am following a course online, and during a point of using different colliders, for a character and level, but the character still falls through the designed level. When I created a level using a different part of my course everything seemed to work fine, but with the tutor moving onto using mesh colliders, box colliders and rigidbody it doesn’t seem to work.

I know I should contact the tutor and ask for help, but cannot seem to find any contact details on the site I am taking the course. I hope someone could give me some advice on how to make it so my character will interact with the level I have built around it.

Thanks.

There is literally no information you have provided that wpuld enable us to help you. I suggest you follow a genuine Unity tutorial instead: 3D Physics - Unity Learn