Howdy and welcome
What sort of stuff are you interested in? There is physics and function, and then there is legal stuff, which often purports to deal with physics and function but often doesn’t.
stuff is very variable by nation due to restrictions and laws. The USA in particular seems to be going more or less insane at the moment (or more insane than usual at any rate) and may not be particularly pertinent. As this is an international forum, nation of origin is very helpful determining what might be useful to you.