There are many ways to determine which efforts are producing results and which ones aren't. For example, you can study your website's analytics through your web host or by using Google Analytics. Most social media sites provide analytics as well, or you can use tools such as Hootsuite to get social media analytics. Your email service should also provide you with information on the open rates and engagement rates for your emails.
How Much of this Guide Should You Read? This guide is designed for you to read cover-to-cover. Each new guide builds upon the previous one. A core idea that we want to reinforce is that marketing should be evaluated holistically. What you need to do is this in terms of growth frameworks and systems as opposed to campaigns. Reading this guide from start to finish will help you connect the many moving parts of marketing to your big-picture goal, which is ROI.