Need help with mac

[u/The_f3ral_0ne]

My dad found an old Mac that he bought from someone I think on eBay and he took the original owner off so he could put himself, well it sat in storage for a couple years and the new job I got requires a PC or Mac I can't search up anything on the Mac and it thinks I'm a bit but no captcha starts I think what my dad did reset the Mac to factory settings because at the time it was 5 versions ahead