I took a course on Internet marketing at https://lectera.com/en, because I recently started to deal with this closely, and I only had experience in offline marketing. I was very pleased for many reasons, the most significant - the old ones were systematized and new knowledge was added :) But the atmosphere itself was also a huge plus for me, we had a lot of fun doing our classes, we always found something to laugh at :) I began to immediately apply all the acquired knowledge to practice in the current work and already see the results.