Assistant in game feature

Hi I’m wondering how to let the character hang onto the wall and stick onto to it like in the clip below and also how to let the character kill entities by jumping on them like Mário.

I am clueless in scripting so id appreciate it if someone told me or helped me in developing which ever they can do. Because I’m more of a builder than a scripter

I tried lookin up tutorials but there’s nothing on this so id appreciate it if someone could help