Object Constraints

I’m honestly quite new to object constraints, and I wasn’t sure where to post this.

But I have a question regarding a certain constraint. The Floor Constraint.

I wanted to know if this can be used so that when animating, you can easily animate feet for example, and not have them go through the floor. Can this be used to do this? If not, then is there something else that can?

That can be use for that but ,before, you have to rig your leg bones with inverse cinematic constraint.

May you be so kind as to explain how to do this?

Okay, thanks!