Gmail has 4.2 billion users. But only 0.1% know how to use it effectively. Unlock their secrets with these 10 hidden tips: 🧵

1) Undo the email you just sent. See below how to undo it: → Settings icon (top right). → Settings > General → Activate the "undo sending" option → Choose 30 seconds

2. Get rid of promotional emails. → Type "unsubscribe" in the Gmail search bar. → Now, select all emails with the unsubscribe label. → Now just tap on the delete button to delete them all.

3. Send confidential email. You can make your email confidential by disabling the copying, printing and forwarding functions. To activate them, click on the padlock symbol when sending a new email.