Recently I want to re-learn some techniques I has when I was in highschool : calculators.
I think it’s good for boosting my aging brain, and also for the nostagia. Then I went and bought the Casio Classpad 400+E and the Casio FX CG50; together with TI NSpire CAS II and HP PRime G2 I bought few years ago for my engineer jobs, now I have enough to play with.
I also discovered that reddit has a sub for that : r/calculators which is nice (people there are not so nice however, as expected for weirdos who like maths haha), I now know there is RPN calculator maker named SwissMicros, but that’s another story, they are pricey, and not right for the moment.

So, when owning these monster of calculating, finding goos resources for tutorials, tricks and techniques is th enext step. Here is what I found :

These sites have programs which users developped and shared, I found lots of real useful technical stuff there.

So, happy learning.