AS A DEVELOPER, MY MOST IMPORTANT TOOLS ARE A PEN AND A NOTEBOOK

Summary from the TLDR newsletter

A notebook is the most important tool to have as a software developer. While writing code is a necessary part of the job, more important than writing that code is figuring out what code to write. Writing and sketching are powerful tools for thinking through problems and they can help turn vague abstract ideas into tangible artifacts. Using a notebook also leaves behind a copy of your thoughts and the process of how you reached them.