vorangehen
to go ahead
To walk or travel ahead of someone else in a physical sense; to take the lead of a group.
Geh du schon mal voran, ich komme gleich nach.
You go ahead, I'll follow in a moment.

to go ahead / progress / happen
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to go ahead
To walk or travel ahead of someone else in a physical sense; to take the lead of a group.
Geh du schon mal voran, ich komme gleich nach.
You go ahead, I'll follow in a moment.

'Vorangehen' (to go ahead/progress/happen) is a separable verb. The prefix 'voran' stands at the end in a main clause, but remains attached to the verb in a subordinate clause.
Die Arbeit geht gut voran.
The work is progressing well.
The subject of the sentence helps you recognize the meaning. A person goes ahead physically (meaning 1), a project makes progress (meaning 2), and an impersonal 'es' or 'was' asks what is happening (meaning 3).
Der Reiseführer ging der Gruppe voran.
The tour guide went ahead of the group.
In the meaning 'Fortschritte machen' (to make progress), 'vorangehen' (to progress) is often accompanied by adverbs that describe the speed or quality of the progress. Common examples are 'gut' (well), 'schnell' (quickly), 'langsam' (slowly), or 'zügig' (swiftly).
Mit dem neuen Team geht das Projekt endlich zügig voran.
With the new team, the project is finally progressing swiftly.
In the meaning 'geschehen' (to happen) or 'passieren' (to happen), the verb is often used in the question 'Was geht hier vor?' (What's going on here?). It expresses curiosity or confusion about a situation.
Als die Polizei kam, fragte ein Nachbar: „Was geht hier eigentlich vor?“
When the police arrived, a neighbor asked, 'What is actually going on here?'
The idiom 'mit gutem Beispiel vorangehen' (to lead by example) is a fixed combination. It means to behave in an exemplary way so that others follow your behavior.
Die Chefin geht immer mit gutem Beispiel voran und macht selten Überstunden.
The boss always leads by example and rarely works overtime.
to happen / pass
'passieren' and 'vorangehen' can both express that something happens. 'passieren' is the normal and very general word for this: it is simply about an event or incident. 'vorangehen' is more suitable when you are asking about the background or want to say what happened beforehand. Learners may confuse the words because both have to do with events. As a simple guideline: if you only want to say that something is happening, 'passieren' is usually more natural.

Dem Streit ist ein langes Gespräch mit dem Chef vorangegangen.
The argument was preceded by a long conversation with the boss.
Auf dem Weg zur Arbeit ist heute ein kleiner Unfall passiert.
A minor accident happened on the way to work today.