から

から marks where something starts: the place a movement begins, or the time an action begins. It follows the noun, and English has "from" or "since" for it.

から and に

に marks where a movement ends and から where it starts, so swapping them reverses the trip.

On a time, から replaces に. The two are never stacked: ×九時にから働きます.

から with まで

から gives the start and まで the end, for places and for times alike. Either one can also stand on its own.

"Since" with ～ています

With a ～ています verb, the action started then and is still going on, which English says with "since".

Usage notes

These go beyond a starting place or time.

From a person

The person something comes from takes から as well.

から after a sentence or a て-form

After a whole sentence rather than a noun, から gives a reason: "because", "so". After a て-form it means "after doing". Both are separate grammar points.