Nest cam is the best solution for video surveillance. Nest cam is wireless so it can be installed anywhere within range of your WiFi. Nest cam can be viewed remotely and Nest remote recording plans include all cameras that you add to it. Plans are as low as 60.00 / year.
Nest Hub Max is a Google Home Assistant with a built in Nest Cam and is a great solution for home control + indoor surveillance. The built in Nest Cam camera also enables video calling.
Anyone who wants or requires constant recording on site or at home, will be very happy with Blue Iris. The best video monitoring soltuion at a cost
ReoLink 5mp POE cameras a great solution where wired cameras are required or desired.
Nest/Yale door locks are a great way to enhance security. Used in conjunction with a Nest Hub or Nest Hub Max, you are alerted when someone is at the door ("Someone is at the front door") and are able to respond to them by voice by tapping talk on the Nest Hub or Nest Hub Max. With the Nest Hub Max you can also do room to room video conferencing or use it as a baby monitor by saying, "Hey Google, show me the baby's room"