please answer with easy words and summarized plz

1. Why should businesses use loyalty cards or apps?

2. CRM keeps track of a business' existing clients and potential clients. What kind of information does it store about these individuals?

3. What is the most successful CRM in today's market?

4. What are three essential shopping cart features?

5. Give an example of how a site like Amazon can be an affiliate for a private company.

6. Give an example of how a private company could become an Amazon affiliate.

7. What should an Etsy seller take into consideration before setting a product price?

8. Give two examples of something that could be split-tested.