HubSpot Academy is one of the best ways to learn about digital marketing, sales, and more. After you complete the course and pass the test, you receive a certificate that’s valid for two years, which helps show that you really know your stuff. Review collected by and hosted on G2.com.

The only downside to HubSpot Academy is a personal one: finding the time to finish each course can feel exhausting, even though it’s well worth it. Because it’s so easy to see exactly how long each chapter will take, it can cause a bit of anxiety as I work through the material. Other than that, I don’t see any real downside—unless you’re on a slow internet connection or using an outdated computer. Review collected by and hosted on G2.com.