In my maths lesson, we're doing some stuff fairly boring right now. To make it a bit more enjoyable, I decided to build little cheat sheets and to post them online.
They're designed to also save time. For example, in the data analysis section, you can paste your data in, and all the infos about it will be displayed on the right. Explanation about how to get those infos manually are displayed bellow.
So, hopefully it'll help some one, or save time. 🙂