how do I factory reset Mac book catalina
I bought a refurbished Mac book crptapmk4n2llarb 2017 and need to return as keys stick and make it impossible for me to enter my password as the keys that stick are the ones in use. I need to delete and factory reset before I can send it back and I have gotten instructions from seller watched YouTube videos and searched for info to help me but nothing seems to work. Its running Catalina 10.15 I believe. and has update for big Sur but never downloads when I try to update I figured it was a memory thing. I believe I got my account deleted but I can not for the life of me find the iTunes or general erase all and rest options I've read. I've also tried command R NOTHING WORKS. Can anyone hep me please?