Here’s the the recording of a talk I gave a few months back about Exercism and the Emacs Lisp track at the Emacs Berlin Meetup. I had originally planned to attend in person but fell ill and gave the talk remotely. There’s a lot of coughing going on, sorry. 
I think there are a few things that I got wrong or was unsure about as I was still quite new in contributing to Exercism. Runtime is 90 minutes. The recording includes Q&A segments not only at the end but also interspersed throughout the talk.
Slides are here: talks/202301-emacs-berlin--exercism-emacs-lisp at main · fapdash/talks · GitHub