Didn't Know This ... Quick Delete Gmail emails

Here is a quick tip to simplify and speed up deletion of emails (if you use the iPhone email app and Gmail)
1. Open the Mail app on your phone
2. Tap on the Gmail Inbox
3. Tap Edit at the top of the screen
4. Tap each blank circle to the left of the email you want to delete (to check it)
5. Touch Trash at the screen bottom
6. Finish by confirming delete (Trash)
Source: Delete Instead of Archive Your Emails on the iPhone