The Contacts Section lets you manage an online address book of contacts with categories, custom fields, and even custom views. Contacts will show up with auto-complete when you compose an email in the Mail section.
List View & Card View
In both List View & Card View, you'll have access to all of the same features, including Print, Import, and Export.
On the top right of the Contacts Section, you'll see "Default View", the List View and Card View toggle, and the category selector (it's on "All Contacts" by default). When you click on "Default View" you'll have option to create new views, which are customized layouts with the fields you wish to display and any kind of filtering and/or sorting:
Adding a Contact
On the far left, you'll see a blue button to create a new contact. After you've clicked the button, a new contact form will slide in from the right. Any fields you wish to store with your contacts, if the field isn't already in there, feel free to add custom fields to your contacts.
Viewing & Editing a Contact
On the far right of the contact list are checkboxes. To move, copy, delete or add one or more contacts to a category, check off their corresponding checkboxes and then choose from your options on the Contacts menu.
Click on a contact in either List View or Card View and the contact will slide in from the right. Click the "Edit" button to edit fields: