I've got the Ring doorbell as well as a couple of Nest cameras and I love them both. The doorbell is a simple install and it runs off of your wifi. You get alerts when theres motion or when someone rings your doorbell and you can pull it up on your phone and talk to whomever is at your door.

The nest cameras are nice and easy to set up as well. You just need a power source and wifi. You can also speak through the nest cameras. Well worth the money in my opinion.