Looking for recommendations on wireless camera system for outside and inside home. Prefer to spend under $500 if possible. Looking for a camera on my front door, garage to watch vehicles in driveway, backdoor, and in house.

If you don't want to spend a fortune, look into Wyze cameras. I've been impressed.

We have really liked Arlo. Free cloud storage for seven days too, so no contracts or additional charges. Just the cameras.

We used David with Advanced Security Concepts. He got us a wired camera with a DVR for our old house. Under $500 for sure. Was not hard running the cable through the attic. They used a long rod drilled a small hole and pulled it right through. I went through the same thing with the wireless. They are nice but you still need to run a wire to power them up. So they are not "wireless" I found they are pretty unreliable since they run on the 2.4ghz band and it has so much interference and that is NOT good when you are trying to stream a hi-def image. At a still picture it works ok, but when people walk or the trees blew it all pixelated. You could not even make out a face. The throughput was just not enough. Maybe a 5ghz would work better but I did not try it. If you have to run a wire to power up the camera why not just run the dual coax or a outdoor rated cat5? If doing ip cameras.

Best bet, call a pro and get a quote so it's installed right and done by a professional. You don't want leaks or bugs finding their way into a new hole you made.

Any thoughts on the Ring cameras and/or security systems in general?

Is this system expandable with additional cameras? If not any recommendations for six camera set-ups?

I bought a reolink system off Amazon and installed it myself. 4 POE cameras and and 8 port NVR with 2TB drive. Running the cat5 was no problem.
I think I spent about $700 including camera system, a box of cat5 as I was doing some other rewiring, terminator kit.