English Grammar Launch Advanced: Upgrade your speaking course from Udemy it is, as the name implies, a continuation of English Grammar Launch, which I already reviewed. This course is simply more of the same: 6 hours of video, transcripts and MP3s, but with more advanced topics like three-word phrasal verbs, passives, the more complex verb times, relative clauses, "unless", "whether" and other interesting lectures.
Although again it feels way too slow unless you set the speed to 1.25x, this is an example of a good online course to improve (or just train) your English skills.