I've taken many courses on cryptocurrency, but these are among the best. Alexander Orlovsky not only provides theoretical knowledge, but also shares his experience, which is very valuable. I especially liked the lessons on market analysis; now I can make decisions on my own. True, it was sometimes difficult to combine studying with work, but that's my problem. I also want to note that after the courses, I became part of a large community where you can communicate with other participants and share experiences. This is very helpful in development.