For simple one time events such as a concert, use the “one time event” option.
For time slot ticketing, use multi-date (and add a Date for each time-slot)
For multi-day festivals, if you need to sell tickets to each day, use a multi-date event. If selling a single ticket for the entire festival/event, just use a simple “one time event”
For museums, attractions, or any sort of venue that does repeating events (e.g. daily), use the “recurring event” option