verlassen
to leave
To go away from a place, person, or group for a short or long time.
Er musste die Party früh verlassen, weil er am nächsten Tag arbeiten musste.
He had to leave the party early because he had to work the next day.

to leave / rely
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to leave
To go away from a place, person, or group for a short or long time.
Er musste die Party früh verlassen, weil er am nächsten Tag arbeiten musste.
He had to leave the party early because he had to work the next day.

The verb 'verlassen' (to leave) has the prefix 'ver-' and is inseparable. This means the prefix remains firmly attached to the verb in all tenses and sentence types.
Er verlässt das Haus immer um 8 Uhr.
He always leaves the house at 8 o'clock.
Pay attention to the difference: 'verlassen' without a reflexive pronoun means 'to go away from'. 'Sich verlassen auf' with a reflexive pronoun and preposition means 'to trust' or 'to rely on'.
Er verlässt die Firma.
He is leaving the company.
When you leave a place or a person, the verb 'verlassen' (to leave) needs a direct accusative object. Unlike in English, no preposition such as 'von' (from) or 'aus' (out of) is used.
Wir müssen das Gebäude sofort verlassen.
We must leave the building immediately.
In the meaning of 'vertrauen' (to trust), the verb is always reflexive ('sich verlassen') and is used with the fixed preposition 'auf' (on) and the accusative.
Auf dich kann man sich einfach immer verlassen!
You can simply always rely on you!
In the figurative meaning, the subject of the sentence is a force or feeling (e.g. 'der Mut' (courage), 'die Kräfte' (strength), 'das Glück' (luck)). The person who loses it is in the accusative.
Gegen Ende des Marathons verließen ihn die Kräfte.
Toward the end of the marathon, his strength left him.
to go
'gehen' and 'verlassen' can both mean that someone goes away from a place. However, 'gehen' is more general and often does not need an object: you simply say that someone is leaving or going to a destination. 'verlassen' is more specific and normally has an object, such as a room, a house, or a group. It often sounds a bit more deliberate or formal. Learners may confuse the words because both have to do with leaving. As a simple guide: you 'gehen' away, but you 'verlassen' a specific place or group of people.

Bitte verlassen Sie das Gebäude durch den Haupteingang.
Please leave the building through the main entrance.
Nach dem Essen geht Paul nach Hause.
After dinner, Paul goes home.