Avoid Reaching 0%
It isn’t technically healthy for a battery to be at the 0% or 100% mark. These extremes affect your battery in the long run, and the best practice would be to keep it charged somewhere in between.
Avoid using or leaving your iPhone or MacBook at 0%. If you’re not going to use a device for a long time, aim to keep its battery at 50%, so it stays better preserved throughout that time.
It’s also recommended that you don’t fully charge your devices in order to keep your battery healthy, although we know that’s not probable, especially if you charge your phone at night.