Software Licensing and Open Source
Every engineer uses open-source software constantly, and almost none read the licenses — which is a quiet risk, because those licenses are legally binding terms that govern what you can and can't do with the code, including obligations that can affect your own product. The difference between a permissive license and a copyleft one can determine whether you can keep your code proprietary. Understanding software licensing, especially open source, is among the most practically important legal knowledge for a working engineer. (Educational, not legal advice.)
Every engineer uses open-source software constantly, and almost none read the licenses — a quiet risk, because those licenses are binding terms governing what you can do with the code. The difference between permissive and copyleft can determine whether you can keep your code proprietary. (Educational, not legal advice.)