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Sure!

Step 1. Read the documentation.
Step 2. Return to step 1 until you understand.

You want to create programmatic or by control panel?

Steps for creating user-group using control panel

1. After login as admin, click on Admin option from control panel.
2. Select the last option control panel.
3. From the users column select users group.
4. Click on Add and add new user group and save.
5. After creating user group you can select action button there and assign members, permissions as required.

User Group is always assosciated with a site.

Logu,

Liferay provides amazing documentation which is very easy to follow and understand.

Also if you are looking to understand how to group users then there are various ways you can do it. This entirely depends on the requirement or solution you are looking for.

Please read the documentation carefully, you will get all your answers.

Thanks,
Ankit Kulshrestha