hanatamago

[pliant slate]

Please be patient

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[prime tusk]

as a personal pronoun, "on" means the same as "nous", but is way more casual. You'll basically never see "nous" used as a subject pronoun in casual speech as it's very formal.
Note that's despite that, "on" uses the il/elle conjugation.

"on" can also be an impersonal pronoun, and has other use cases beyond that. It can be used to indicate anyone, or convey passive voice for instance. Don't assume it's always "we"

while "nous" basically goes unused as a personal pronoun in casual speech, it is very much used as an object pronoun.
For instance, a sentence like "on nous a menti" is completely natural (we got lied to)
-# note how "on" acts as passive voice here. "[someone] lied to us"

[fallen trail]

ok interesting, that makes sense

[olive harbor]

Adding on to Flynn's excellent answer, in French we have something called tonic/stressed pronouns. We use them in two contexts:
(1) Prepositional objects
A pronoun when modified by a preposition will use the tonic form. « J'ai écrit cette lettre pour toi (I wrote this letter for you ». The second person singular « tu » becomes « toi » because it comes after the preposition « pour ».
(2) Emphasising something
In French, when we want to emphasise something, we repeat the word in pronoun form. « Lui, il est professeur (He is a professor) » or « Qu'est-ce que tu veux, toi ? (What do you want?) ».

In both contexts, though « on » is used to replace « nous », we'll still use « nous » as a stressed pronoun. Here's an example of each order accordingly.
(1) « Pour nous, on participe pas à ce jeu. (As for/In regards to us, we're not participating in this game.) »
(2) « Nous, on veut parler. (We want to talk.) »

[fallen trail]

Ok, that makes sense!

[dawn willow]

I feel like I must clarify that even if you are using On to mean Nous, you still use Se if you’re using it pronominally (i.e. reflexively)

On s’aime. → We love each other.

On se dit des choses importantes. → We tell each other important things.

On se retrouve souvent après le travail. → We meet up often after work.