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Don't trust Excel's COUNTA function to count non-blank cells—here's a better method

Counting non-empty cellsThe COUNTBLANK-COUNTA conflict (and how to fix it)Summary: Choosing the right counting functionIn ...
Miami University

Using and Creating Functions

Although there are many functions in the base package of R, sometimes there may not be a function that does exactly what you want. In this case, R allows users to create their own functions and call ...

I took Harvard's free online coding classes to better catch AI's errors - and they're legit

Harvard's free programming classes teach you how to think, debug, and adapt in an AI-driven world where knowing code matters more than ever.
BBC

Counting in 25s

There are two 25s in 50 and there are four 25s in 100. If you remember this, it helps you count in steps of 25. Look at this number line. With every two steps of 25 there is a bigger step of 50.