Do I have to use my Lift Ticket on consecutive days? What does 2 out of 3 days mean? Can I take break days in between?

Depending on the Lift Ticket, you or may not have to ski consecutive days. 

Epic Day Pass:

Epic Day Passes can be used non-consecutively. If you have an Epic Day Pass, you can ski any day of the season provided your start date is on a blackout date according to the number of days you have purchased. For example, if you have purchased a 3-day Epic Day Pass on a blackout date, you can ski any 3 days during the season. If your Epic Day Pass starts on a non-blackout date, you can ski any day of the season outside of blackout dates according to the number of days you have purchased. Please check the Epic Pass website for blackout date details.

All other Lift Tickets:

If your Lift Ticket says 2 out of 3 days, you will be able to ski 2 days across the period of 3 days from your start date. This means you have an option to take 1 break day in between.