What indicators to choose for the report?

Question

Google Analytics

Good afternoon!
Can you please tell me how to generate such reports?
There is a hypothesis that when adding offers to the site (to the category and card), the conversion will increase, but how to analyze this indicator is not entirely clear, since it is impossible to tie this functionality to a goal or event, and the overall conversion may increase/decrease not due to this action

Answer 1

test 1 hypothesis at 1 point in time. Then, while maintaining the quality and quantity of traffic, you can analyze the change in conversion