You can test the effectiveness of different content pages of your website by measuring how many people sign up for a newsletter, buy something or take another action that you have planned as an outcome for the marketing. Measure the number of visitors to the page, and the number that take action to calculate your conversion rate:
(Number of people who take action/Number of people visiting the page)*100 =Conversion rate
Conversion rates: The proportion of visitors who take the desired action when they come onto a page on your website
Example: If 100 people visit your site and 3 sign up for your newsletter, you have a conversion rate of 3%.