In my presentation from the JavaScript for WordPress Conference, I talked about how you can grow your JavaScript and related skills through building with WordPress. You can watch the recorded video on YouTube.
There is also a written version of the same talk published on my blog a few months back. If you prefer reading, check out the Growing JavaScript Skills with WordPress post.
Growing JavaScript Skills with WordPress
For all the talks from the conference, go to https://javascriptforwp.com/conference/2019-archive/.