u/GenericUsernames99

I recently acquired this truck from a relative, and was working fine until today, I try to get started this morning, engine isn't turning over, makes a clicking noise I believe near the alternator

I am absolutely empty in terms of mechanics knowledge on it, I do not know how to diagnose the issue correctly, I don't even know if it's the alternator, but I believe it's the alternator

can any of you confirm if this is the alternator, if so, what should I do to get the vehicle running again??