I own a condo where there is an RJ-45 jack (ethernet) in most of the rooms so I can plug in a computer, using an ethernet cable, at any location in the house. I had it wired that way when the ISP set things up. It's not that hard if you want to add the cabling.

If you don't want to spend the time running the cable through the walls, then think about the various types of Powerline ethernet modules. See the link below for one such option.:

https://www.bhphotovideo.com/explora/computers/tips-and-solutions/add-hard-wired-ethernet-port-any-room-minutes

Hope this helps.

Grif