Notepad is one of the most versatile applications you could use. You can open almost everything in it. You can write scripts in it, you can make web pages in it. You can do almost anything with notepad. Make sure you know the quickest way to access it… if you hold the Windows Key + R, the run box will pop up. you can just type notepad into here and it will open for you.
Maybe everyone knows this already… I didn’t know it until I saw an engineer do it like 10 years ago, but I use it like 50 times a day now. It is a great place to take notes quickly.