Hi R. Neck Joe,
Sorry I don't do any of the the doorbell or the locks stuff BUT, camera's I do! I use
these. I have 5 around my house in various places, including one in the squirrel house (Mom/Rocket J had
new babies ....Boris and Natasha

) and 4 at work, all of which I can set to get motion/sounds alerts, (among other settings, including two way talk) sent to my phones (BTW Joe, you did pre-order your
S9 didn't you? I did...heheh). Simple to use, no video cables to run (wireless video), not too expensive and have tons of features .
You can view all cams on one pages and then select each individually to setup/monitor from Samsung's web(PC)/app(phone) page .......The outdoor camera's I use are their indoor camera's that I just make sure can't get wet, think cuz I'm cheap......However, they do make specific outdoor types.
I'm sure there are many more super high tech/more than likely much more expensive systems others may use but, these work well enough for my simple needs. However, the feature I believe to be quite eliquent is the fact that once setup,the cams don't need the interent/wireless connection in order to do their job, they will record endless loop internally in the SD card as long as they have power
............Get some at Costco or get all on Amazon