Right at the start there is mention of providing some “slash” sprite to add to the sword, but there is no download available for it (yet).
I grabbed the “Slash Effect.png” file from the gitlab commit for the lesson, but I don’t think everyone knows how to do that.
Also, it might be much easier for students if you could provide one archive at the start of the section which contains all asset files to be imported, perhaps with one sub-folder per lesson?