Yay, got my outdoor outlet hooked up last night!
Another question, the circuit breaker its on is 20A. But the outlet I tied into was 15A, as was the outlet that came with outdoor one (and apparently every other outlet in the house). Is that normal? My assumption would be that they should match.
How old is your house?
15 amp was considered standard for a long time (as in decades). 20 amp more recently (as in many years/few decades).
It is going the wrong way but unless you're maxing out circuits it might not matter.
Houses now have more electric draws than they ever used to but they are low draw. Led lighting, modern TVs , security cams, etc.
Old school stuff drew much more.
Yes, you should trip the breaker before you reach the limits of the other hardware (outlets, wiring, etc.).
Do a load calc. and you might find you're well within the limits of either.
The answer is always "it depends".
You're not going to burn your house down as long as you don't need coffee, brew beer, and make toast at the same time.
Biggest draw on anything is things that change temperature. Coffee makers, toasters, microwaves, air conditioners, furnaces, water heaters, refrigerators, freezers, etc.
Your nest cameras and your nerd stuff don't draw much compared to those.
Just remember anything that changes temperature are the big draws.