hinfort
henceforth
An outdated word meaning 'from now on' or 'in the future'.
Der König befahl, dass seine Gesetze hinfort im ganzen Land gelten sollten.
The king ordered that his laws should henceforth apply throughout the whole country.

henceforth / begone
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henceforth
An outdated word meaning 'from now on' or 'in the future'.
Der König befahl, dass seine Gesetze hinfort im ganzen Land gelten sollten.
The king ordered that his laws should henceforth apply throughout the whole country.

The word 'hinfort' (henceforth/begone) is very outdated and today is used only in historical, literary, or ironic contexts. It is not common in normal usage.
In alten Märchen liest man oft Sätze wie: „Hinfort sollst du als Stein leben.“
In old fairy tales, you often read sentences like: 'Hinfort sollst du als Stein leben.' (Henceforth you shall live as a stone.)
The word is made up of 'hin' (movement away from here) and 'fort' (away). This double emphasis on 'going away' strengthens the meaning.
„Hinfort mit diesem Gerümpel!“, rief sie und zeigte zur Tür.
'Away with this junk!' she shouted, pointing to the door.
You can recognize the meaning 'away from here' by the fact that 'hinfort' (begone) serves as a short, direct command or exclamation. The meaning 'from now on', by contrast, introduces a longer sentence that describes a new rule or a future state.
„Hinfort, Unhold!“ ist ein Befehl zum Gehen.
'Begone, monster!' is a command to leave.
When 'hinfort' (henceforth) means 'von nun an' (from now on), it often appears at the beginning of the sentence in position 1. In this case, the verb follows directly after it in position 2 (inversion).
Hinfort werden alle Bürger gleich behandelt.
Henceforth, all citizens will be treated equally.
out / beyond
'hinaus' and 'hinfort' can both have to do with going away. 'hinaus' is a normal modern word and describes movement from inside to outside. 'hinfort', on the other hand, is outdated and sounds very literary or stern. As an exclamation, it means roughly that someone should go away. Learners may confuse the words because both can express a direction away from the speaker. In everyday German, people almost always say 'hinaus' or 'weg'. 'hinfort' only really fits in old texts, fairy tales, or very dramatic language.

„Hinfort!“, rief der König in der alten Geschichte.
"Begone!" cried the king in the old story.
Der Hund läuft zur Tür und will hinaus.
The dog runs to the door and wants to go out.