Overview of New Gmail

What's New in Gmail

  1. Reference, create, or edit Calendar invites right from your inbox (and more!)
  2. Snooze emails to move them out of your inbox until a specific time* (only available with Conversation view on)
  3. Be reminded to respond to or follow up on messages with Nudges
  4. Act on your messages (archive, delete, mark read/unread, view attachments) right from your inbox
  5. Reply with suggested responses from Smart Reply (as of October, 2018, you can turn this Smart Reply off in settings)
  6. Open and close sidebars for more room for your email

Learn more: https://support.google.com/mail/answer/7677724