"For those who are just starting to use segmentation in Google Analytics for A/B testing, I suggest you focus on these few key types of segments:

• Traffic source
• Location/geography
• Visitor type
• Landing page type
• Action taken
• Content viewed
• Engagement – Different pages in your website may have varying levels of customer engagement. Creating a segment type based on engagement helps you make improvements to pages that produce less engagement.
• Demographics
• Technology platform
• Value – One of the classic segmentation techniques is to segment your visitors based on their value. You can then identify the source of these visitors and their journey towards your conversion goals."