Excel · new guides in progress
I'm Eoin Derry — an IT professional turned Excel teacher. I write long-form guides that turn messy spreadsheets into clear answers: the why before the how, every time.
One email per guide. No digests, no selling your address.
Start here
Excel isn't a pile of tricks — it's a course: six stages, sixty-plus lessons, in order, free. Every lesson links to a full guide, so you can always see what's covered, what's next, and where you are.
Latest guides
The macro recorder turns a fiddly manual routine into a button — how to record one properly, read what it wrote, and the honest map of what belongs...
The workbook is good now — its home probably isn't. The three places a Microsoft 365 file can live, what each is for, and the placement rules that ...
The final power-user skill is knowing the tool's edges — the honest signals that a job has outgrown the spreadsheet, and where each kind of job goe...
On video
The same teaching, on screen — short, careful videos where you watch the spreadsheet come to order in real time. Subscribe now and you'll be there for video one.
Subscribe on YouTubeWho's writing this
Twenty years keeping infrastructure honest taught me one thing: in every office, in every job, the real system of record was a spreadsheet. I teach Excel the way I learned to run networks — from first principles, carefully, so it stays understood.
More about meThe ledger
No digests, no "content", no selling your address. When a new piece ships, you'll know.