Below is the step to why you want to be a guru in Gmail.
Click on the Mail scroll-down menu icon on the top left of your Gmail inbox
Click Contacts
Check the box next to the names you’d like to add to your contact group
Go to the top of the list and click on the group icon
Now you can either create a new group or add to existing group
Your group will then show up under my contact on the left side of your screen
Also, when I mention “contact manager”, I’m referencing your Google Contacts page. You used to be able to get to this page directly from GMail. Now, you have to go to https://contacts.google.com
How to Create a Group in Gmail
Visit Google Contacts.
Click “Contacts”, “Frequently contacted”, or “Directory”.
Select the contacts you want to include in your group.
Choose the “Label” icon and press “Create Label”.
Name your label and type your group’s name in the recipients box to send an email to them.
How to use contact groups
Compose an email
Instead of typing someone’s email address, type in the name of the group you want to send it to
Gmail will automatically generate the email addresses in that group