Answer : Yes, absolutely. If you're looking for recommended classes, The Ask an Interior Designer blog has a weekly series of lessons on various topics. You can also purchase online courses from General Assembly and find online classes at Udemy and Skillshare.
When trying to learn practical skills like interior design on your own, it's important to get a feel for the underlying principles in order to learn how to apply those principles. Once you have some experience with design through reading or working with a designer when shopping for furniture or picking colors off the website of paint company, then kudos if you are ready to take on the task of designing your first room (or first few rooms) yourself.