Why it exists
Most Excel courses are videos. They make sense while you watch, and then the formula won't come when you open a spreadsheet. We think the fix is practice that answers back: you type the formula, press Check, and if it's wrong you find out what happened and why, not just that it's wrong.
How the checking works
- Your result is what counts. The checker runs your formula on the data, so any approach that gets the right answer passes.
- Mistakes are explained. Common errors, like an unlocked reference or
>where you needed>=, get a plain-English explanation. - Formulas, not typed answers. A number typed in by hand doesn't pass, because it won't update when the data changes.
Who makes it
I'm Eshagh Shahnavazi, a computer engineer in Istanbul who works with business data every day: in Excel, in SQL databases, and in the AI systems built on top of them. I'm co-founder and engineering lead at Fenext and co-founder of Fennaver Academy, which teaches coding, robotics and AI to students aged 9 to 18. I'm also doing an M.Sc. in Computer Engineering at Istanbul Technical University.
Hands-On Excel is the practice tool I wanted for the people I work with and teach: short exercises in a real sheet that tell you why a formula is wrong.
More about my work: eshagh.dev · LinkedIn · GitHub · X. Questions, ideas and bug reports are welcome at [email protected].