Depending or the location of your home router, you may want to add another router and set it up as an access point. I did that in my detached garage. I just ran Cat5 from the main router to my other router that is set up as an access point in the garage. They're far enough apart that I can even use the same SSID and password for both routers.
LINKOFF TOPIC:
I also have a router in my RV and a cable modem. Most of the time when camping, we buy high speed cable internet from the cable company.
I don't use that RV router at home. I just unplug it when home and the RV PC connects to the garage WiFi access point.
My RV WiFi also has the same SSID and password. That way our phones and devices connect just like at home so I can also take Alexa and any smart plugs etc along. Everything just connects right up. Alexa doesn't care since the router is named the same as home. All I have to do is plug her in. She connects to the RV router without changing any settings.
I also share the RV's external harddrive on my home network so when at home, I can download videos directly to that drive from the web, or DVD while in the house to the RV in the garage. When we camp, we always have stuff to watch that I've downloaded to the RV.
The main reason I use the same SSID's and passwords is for the smartplugs. That way they don't know they've even left home. They just think the power went off and came back on.
OH! That reminds me "Alexa, turn off the coffee pot" LOL