her
here
Expresses movement toward the speaker or an imagined reference point. Often part of a separable verb like 'herkommen' (to come here) or 'hergeben' (to hand over).
Komm doch mal schnell her!
Come here quickly!

here / ago
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here
Expresses movement toward the speaker or an imagined reference point. Often part of a separable verb like 'herkommen' (to come here) or 'hergeben' (to hand over).
Komm doch mal schnell her!
Come here quickly!

The adverb 'her' always expresses movement toward the speaker or an imagined point. It is often the prefix of separable verbs like 'herkommen' (to come here) or 'hersehen' (to look here).
Kannst du bitte mal kurz zu mir herkommen?
Could you please come over to me for a moment?
When 'her' is part of a separable verb, it stands at the end in a main clause. In subordinate clauses, it appears together with the verb at the end of the sentence.
Er reichte mir das Buch her.
He handed me the book.
To express that a period of time has passed, a fixed structure is used: '[time expression] + ist/sind + [schon] + her'. The word 'her' always stands at the end.
Unser letztes Treffen ist schon lange her.
Our last meeting was a long time ago.
The expression 'hin und her' (back and forth) functions like a single unit. It describes repeated movement between two points.
Er lief nervös auf dem Flur hin und her.
He paced nervously back and forth in the hallway.
As part of the question word 'woher' (where from), 'her' asks about the origin or starting point. 'Woher' literally means 'from which place'.
Woher kommst du?
Where are you from?
from / out
'aus' and 'her' can both have to do with a starting point or a direction. 'aus' often names the place someone comes from or the place something moves out of. 'her' more often shows movement toward the speaker or a reference point. In 'woher' (where from), 'her' asks about the starting point; the answer can then often use 'aus'. That is why the words can be confused. The important point is: 'aus' is used with a place or an inside space, while 'her' describes direction toward the speaker.

Komm bitte her, ich möchte dir etwas zeigen.
Please come here; I want to show you something.
Mehmet kommt aus Köln und arbeitet jetzt in Berlin.
Mehmet comes from Cologne and now works in Berlin.