Google Calendar: Task, Events, and Reminders

In Google Calendar, what is the difference between Tasks, events, and reminders?

[@deepakrao7862]

How can I add the options you have like "event", "out of office", etc. ? coz, I only see one option "Event"

[@gineglover6465]

Why don't I have those options on mine?!?

[@drsimontmunro]

Thanks, Benjamin - this was very helpful :)

[@peterlustig6705]

Thank you, this was exactly everything I wanted to know. Great Video! :)