Workbooks that teach by doing.
Big, practical PDF workbooks in Excel, programming and cybersecurity. Every lesson ends with a hands-on task — and every book comes with a full solutions appendix, so you always know if you got it right.
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- Free sample in every book
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Pick your topic
Three series, one idea: learn the way you will really work.
Excel & Business
Excel, VBA, data, finance, accounting and 15+ industries — worksheets you rebuild in your own spreadsheet.
82 books · 18,183 lessons → Code24LabProgramming
Python, web development, SQL, C++/C#/Go/Java, Git and more — code labs with worked solutions.
8 books · 1,793 lessons → Mobile Security LabCybersecurity
Mobile pentesting, ethical hacking, network and defensive security — for authorised testing only.
5 books · 1,129 lessons →Popular workbooks
Start with one of these — each has a free sample you can read first.
How a workbook works
Read the short explanation
Each lesson explains one idea with the reasoning behind it — no filler.
Do the hands-on task
Rebuild the worksheet in your own spreadsheet, write the code in your own editor, or practise in your own lab.
Check with the solutions
Compare your result with the worked solution in the appendix, then take the quiz at the end of each course.