Creating user groups involves several steps: 1. Collect Data: Gather data from various sources such as sign-up forms, purchase history, and user behavior on your website. 2. Define Criteria: Decide the criteria for segmentation. This could be based on demographics (age, gender, location), behavior (purchase history, email opens, clicks), or psychographics (interests, lifestyle). 3. Use Email Marketing Tools: Utilize email marketing platforms that offer segmentation features to create and manage your user groups.