Some parts seem to have no collision, I go through them and I don’t know what to do, I appreciate help
(Only a small part of the block can’t collide, the rest can)
If Some Admin Flag This, Please Put this post at #platform-feedback:engine-bugs
Is the CanCollide property false?
That’s just how Roblox works. I believe they do this do save memory.
I dont think that, because, I see so much games that dont have this feature, Are totally collision, anyways, thanks for support, and help me specify the post lol
Just place another block inside of the part where you cant collide and make it invisible. 
What are your game settings avatar collisions set to? I think it may be inner, as that can cause the character to clip through things, as it isn’t the full avatar size. I may be wrong, if I misinterpreted what this setting does.
I agree with what @ImTheBuildGuy stated in an earlier post; you should check your avatar settings and see what they say.
Its inner but the same happens
Set it to outer, so the hitbox is on the outside and it doesn’t clip!
Actually, most games suffer this issue when you’re trying to build something like a curb. Try using platforms greater than 2.5 studs tall as I find this works from experimenting.