electrogas

or this: https://matplotlib.org/stable/gallery/showcase/xkcd.html

As a grad student in the 1970's I was working on a magnetron design for a plasma physics experiment. The best resource for such work was a the MIT Rad Lab series of books, a huge collection. What a gift to mankind to have that stuff published in such detail.

Find a university research project that needs some help. Pay will be low but there will be many opportunities to get ideas that will help them. And all the grad students will go on to greater things and pretty soon you'll have a pretty high powered network of people who know your value.