Guides
Free courses that give you a real environment to break
Reading about Linux teaches you nothing. These free courses hand you a live sandbox at no cost.
Why sandboxes matter
Infrastructure skills are motor skills. You do not learn the shell by reading about the shell, and cloud services only make sense once you have created one, misconfigured it and watched what happens.
The obstacle used to be cost: a cloud account meant a credit card and the risk of a surprise bill. Several providers now solve this with time-boxed sandboxes attached to their free training.
Where to find them
Microsoft Learn attaches free browser sandboxes to most Azure paths, so you can provision real resources without a subscription. Cisco's introductory Linux and networking courses run entirely in the browser, including a network simulator. Kaggle gives every notebook a free GPU allocation each week, which is more than enough for an introductory deep learning course.
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