In which case use "player" in which "source", "client"

[Ride1234]

Hello, i'm scripter-beginner. I can't understand in which case i must use "source" in which "player" , "client"..

And how to learn when what must be used?

[Gamesnert]

Use "source" when you want to know what's the main element involved in the event (for instance, source = the vehicle a player entered in onVehicleEnter)

Use "client" if you've triggered a server-side event from the client, and want to know what client triggered the event.

Use "player" if you've actually defined it.