There is a dead comment in reply to the above that says that it is very shallow. Maybe it is too crudely worded, but I also have been left feeling disappointed with the ByteByteGo videos. They actually do feel more like bullet point lists. I don't mean to say it was not a lot of work to produce (especially the animations), but they are not deep dives. It could be a good resource for learning where to start, but it's not what I would call comprehensive or authoritative.