Data visualisation workshops/short courses

My workplace is keen on sending me on some training to tick off development and has asked me to look into finding something.

I think I could sharpen my skills in this area - I’m ok at the coding part but less so on doing the pretty stuff. Has anyone done a local course or know of one they recommend?

The only tool we really use for this is Power BI if it matters but I assume the knowledge would be transferable to other tools.