LinuxSim Blog
Linux tutorials you can actually try, not just read. Every post pairs with a live browser sandbox — no VM, no install.
What does chmod 755 actually mean?
Those three digits are the single most common source of confusion for Linux beginners. Here's the whole mental model — with a sandbox to practice in.
Every git command you need, on one page
Not all 160+ git commands — just the 20 you'll actually use. Grouped by what you're trying to do, with examples you can run in our git sandbox.
Vim is not that bad (10 minutes to "I can use this")
The "how do I quit vim" meme is funny for a reason. Here's the minimum set of vim keys that gets you from "stuck in a foreign interface" to "productive editor" — with an interactive tutor.