Hello. If i choose parent skin to my custom skin, what that does exactly?

Means it will inherit styles, templates from the parent theme

If i create custom skin with custom css and colours etc, is that wise to use dafault skin as parent?

9 minutes ago, Owdy said:

If i create custom skin with custom css and colours etc, is that wise to use dafault skin as parent?

Yes, No, Why?  its up to you lol? is there a reason you want to do this anyways?