One of the best ways to learn new things or improve the knowledge you already have is to complete the courses and listen to the people who have a lot of experience in a specific field. A good course can help you gain new skills, become even more successful and boost your career.
Responsive emails can bring you more website traffic and potentially boost sales. That being said, you need to start creating a responsive design for both mobile and desktop devices. Although more people open their emails using smartphones, there is still a small percentage of the ones who use their computers to see newsletters.