I took a free course on social media marketing. It's a brief program focused on the specifics of promotion on various platforms like VKontakte, TikTok, Pinterest, Yandex.Zen, and others. The course covers more than 10 social networks. Of course, there isn't an in-depth study here. The information is presented superficially, but for those just starting to work with these platforms, it can be quite useful. For example, I was planning to run a channel on Zen and found a lot of valuable information for myself. I also noticed a few more free courses and plan to check them out, but I've put the viral marketing course on hold for now.