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Learn by doing

Short lessons with a practice sandbox right in the page. Read a little, try it yourself, and the lesson checks your work. Free, no sign-up, and nothing you type leaves your browser.

Courses

How the lessons work

  1. Step 1Read a littleEach lesson starts with a short explanation, a few minutes at most, with examples you can send to the terminal.
  2. Step 2Do it yourselfA practice sandbox sits next to the text. You type the commands; nothing is installed and nothing leaves your browser.
  3. Step 3Get checkedA checklist ticks off as you go, hints step in when something goes wrong, and the answer is there if you want it.

Your finished lessons are remembered in this browser (and in your backup), so you can stop and come back any time.