Yeah, my notes from online courses and things all go into org-mode documents. Still plaintext, but with the convenience of inline LaTeX math and executable code

Yeah, my notes from online courses and things all go into org-mode documents. Still plaintext, but with the convenience of inline LaTeX math and executable code snippets. 20 years from now the in-line Python or R might not still run, but the output gets saved into the file at least.