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One payment per course. You keep access to every chapter in it, with no time limit.

Books

Read in the browser, with the terminal beside the text.

Course
Linux
A Linux textbook for engineers
$30 $19.99 one-time · full access
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Course
Git
Git from scratch: version control for beginners
$30 $19.99 one-time · full access
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The same subjects read aloud. Bought separately from the book of the same name.

Audiobook
Terraform
Infrastructure as code, read aloud, for learning on the move.
$15 $9.99 one-time · full access
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Audiobook
How the Internet Works
What happens in the split second between a click and a finished page, read aloud.
$15 $9.99 one-time · full access
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Audiobook
Git in Plain English
Version control read aloud: from your first commit to reading somebody else's history.
$15 $9.99 one-time · full access
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The full text of the course, in your language, readable in the browser.
The Knowledge base stays open to everyone, no account needed. The first chapters are free once you sign in.
Your reading position is remembered, so you pick up where you left off.