Connections - A list of all connections between this volunteer and the opportunities/occurrences  they have signed up for

Volunteer Team Members - a list of all teams where they are a member or a captain with a summary of hours served as part of that team.

Skill Ratings - details from their volunteer skill profile

Registration Answers - Answers to any custom questions that you have added to the standard registration form. (Custom questions can be added by your system administrator).

Open Activities - any tasks or events you schedule with this contact

Activity History - a historical record of past activities. You can also use the buttons here to Log a call, Send an Email, or Request an update (a stock email asking for a review of contact information)

HTML Email Status - a record of emails sent in the past.  The "Send an Email" button allows you to send an email to the contact.  (From here you can use email templates that you have created in your personal setup).

Notes and Attachments - you can attach notes or files to the contact record here.  (Note: notes marked as 'private' are accessible to you and any system administrator - so they are not completely private.)

If you are using SF lightning related lists are presented in a number of different ways.   You may have a "related list quick links" component - that gives access to each related list,  or you can always click on the Related Tab in the page layout: