Also called hitbox, it determines if the object is solid or pass through.

Since Bullet Physics is somewhat buggy some people tend to create custom colliders using Raycast to detect blocks and create physics like movements using vector math. This is done because the Collision script only works on objects with physics applied.

Can I disable the collider/collisions between two specific blocks?

Yes, you can! By setting a constraint with unlimited movement between two objects, the collisions between them are disabled.