A video will not play
If the player keeps loading, your network is probably blocking YouTube: try another network or your phone's data. If the player shows an error, use Open it on YouTube.
The lessons are YouTube videos embedded in the course.
- The player keeps loading: some school, office and public networks block YouTube. Try another network, or your phone's data.
- The player shows an error: choose Open it on YouTube below it to watch the lesson there.
- Turn off browser extensions that block scripts or video, then reload.
- Every module has written notes, so you can keep learning while you sort it out.
Occasionally a creator removes a video. We replace it where we can; tell us which lesson it is.
Updated 27 September 2026
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