I copy and paste into my project diary. Which will also have the question that I'm trying to answer (and perhaps exactly what I googled). And of course the URLs

I copy and paste into my project diary. Which will also have the question that I'm trying to answer (and perhaps exactly what I googled). And of course the URLs of useful things I found. They are often SO. And then I may copy and paste into my diary. Rarely will I paste into source code. Copy and paste errors I find to undo the benefit vs just typing it in and using my own code style.