[!HELP!] How to hack computer on same network

I'm new and need help, sounds like it's said by a noob but ok?!
I've found a way to Bruteforce a WPA2 Network via Android. It needs time yeah, but I'm able to keep the progress even though when I'm not nearby the router. Anyway. I wanted to steal some data from them but I don't know how to hack a PC. Everything is allowed, I've an Android phone a windows Laptop and a kali Linux Laptop so yeah, any suggestions. I thought about some kind of a remote Desktop which don't need a password or a backdoor but that's not my area of ​​Expertise.
PS: I've no physical access to their PC's