Trying to under stand physics (cloth collider and slopes

Hello my question a about the slopes is a essay one what is the best collider to use foe stares , railing , etc?

now for the cloth how do I attach it to a charter? I’m trying to add cloth physics to my characters skirt and hair but how do I keep them on her?
I do know about this dot part . but on my best try I had it hanging off the side of her waste so i do not thank i’m using the tool right.
also can I just paint the top of the hair all at once? it has way to much dots on its mesh to get one at a time

this form is not to active huh