It helps to understand the rhythm of the day and some of the main prayers in order to achieve an appropriate mindset for the day. Join as many as meet your interests.
All classes are free.
You can subscribe or unsubscribe at any time. There is a complete listing of Yom Kippur resources on this site. The Internet is rich with Jewish resources. This page shows you the gates to these resources, so that you may go in and explore. This site is fantastic.