How can one create an evidence of learning?

Question

One of the way to create an evidence is to get a degree, however, with the shooting prices it doesn't seem like an optimal solution.I wanted to know what other ways are available to create learning evidence, I'm especially talking about subjects like psychology, mathematics, etc

mindcrime · Accepted Answer

Publish an (academic) paper in a journal
"Publish" a paper (pre-print anyway) to arXiv.org
Write and publish a book
Write a white-paper
Speak on the topic at a conference, Meetup, etc.
Get featured in an interview on the topic in question
Be quoted in news article(s)
Write an op-ed or column for a magazine
Write a blog post, or series of blog posts
Get a patent
Start an OSS project related to your desired topic
Probably zillions of other things...