Save all of your code. Yes, even those weird goofy projects. It's fun to go back and read it all again. I still have code I've written in high school and unive

Save all of your code. Yes, even those weird goofy projects. It's fun to go back and read it all again. I still have code I've written in high school and university, including a game that a friend and I implemented almost entirely inside a single C++ function. I also now regularly use old code as a kind of mental bookmark about things I've implemented previously. When I'm working on a solution to something I'll sometimes have deja-vu, and I'm glad I still have the old code.