'From' as a preposition indicates a starting point, origin, source, or separation. It can denote a point in space, time, or a range of other contexts.
it is used to show the place or person something originates from. It also shows the beginning of a range or distance, the reason behind an action or emotion. 'From' is also used to show the range between two points, often in conjunction with 'to' or 'until'.
I received a letter from my aunt.
The seminar runs from 9 am to 5 pm.
She suffers from migraines.
The temperature ranged from 20°C to 30°C.
'From' can sometimes be used in a figurative sense. E.g., 'From the heart' means sincerely. Avoid using 'from' redundantly. For instance, 'Where are you from?' is correct, not 'Where are you coming from?'