From Apple about the Activity Rings:
Check your progress
Open the Activity app on your Apple Watch at any time to see how you’re doing. The Activity app displays three rings.
- The red Move ring shows how many active calories you’ve burned.
- The green Exercise ring shows how many minutes of brisk activity you’ve done.
- The blue Stand ring shows how many times in the day you’ve stood and moved for at least one minute per hour.
What are the difference between Move calories and Active calories for you?
The Things app
Probably none
Different people have different preferences and needs. Just use and enjoy your Apple Watch 👍
Probably between 5 to 7 years
If you are not a person of special interest (politician, activist, journalist, or celebrity) for hackers it is very unlikely that your iPhone have been hacked
Until the apps that you want/need don't work any more
I would get a new Apple Watch Series 9 if I could afford it
The Apple Watch is a great smartwatch for some people, but not for all. It is fine if you prefer a Galaxy smartwatch 👍
Probably not