I have a Ring door bell up at the front door. It's very nice. I like because it has community outreach as well. My dislikes are the false motion notices by cars driving on the road. This isn't a knock on the product but the fact that I configured it that way (sensitivity).
I have a Kuna door light above the side garage door. After buying the product, I don't recommend it. If the installation area (old light fixture) is too tall, you won't get notices. The only nice thing is that you can configure it to turn on the lights automatically in the evenings (it changes with daylight savings).
For the perimeter of the house I have EZVIZ. It's nice and easy. You can turn on motion detection to send notifications to your phone as well. Be prepared for birds, insects, UFO's triggering false notifications.
The first device I bought was the Ring doorbell. I bought it for my Amazon purchases. I can see them being dropped off and it can deter (to some extent) people from taking it. One day the notification went off and I checked the video. It was my 3 year old daughter opening the door and walking out to the sidewalk. A car drove by and she ran back into the house. I called her mom immediately and asked her if she was watching our daughter. She said yes, she's right in front of her. I said check your Ring app on your phone and watch the latest video. Paranoia set in, hence the purchases of the other devices.
You mainly want to buy cameras from a reputable vendor that will support their devices. You want them to provide firmware updates ASAP. For example, with WPA2 being cracked, you want them to be able to provide firmware updates to patch the handshake to the AP. You don't want your cameras (smart devices) being the weakest part of your network.