read up, fun thing you can do with your router you might not know about.
look for an ip address on a sticker on the back of the router, enter that ip to your web browser. it will ask for username and password, those will also be on the same sticker. if you can't physically access your router, the ip is usually 192.168.1.1 or 192.168.100.1 or something like that. username and password are usually both admin. once you're able to log in, other people that use the same wifi are your bitches. you can change the password for the wifi itself, block internet for all other people except yourself or just block one specific device, or block specific domains. i'm sure you can do a lot more, shit's too complicated for me. it gets mad funny at my house sometimes lol