It's been a while since I last posted here life, work, and about a dozen half-finished drafts got in the way. But I'm back, and this time I have something worth sharing.
If you know me, you know I'm a cybersecurity person at heart, so Linux was never really a stranger to me. I've touched it, used it, worked around it enough to get by. But "getting by" and actually understanding it are two very different things and last week, I decided to close that gap properly.
So with my few knowledge in Linux going in, I went a bit deeper Linux Essentials, chapters 1 to 3. Not just using it anymore, but actually understanding what's happening underneath. Here's what that week taught me 👇
1. Linux Is a Kernel, Not an OS
This is the one that reframed everything, even with prior exposure.
- Linux itself is just the kernel — it talks to hardware, manages memory and processes
- Ubuntu, Debian, Fedora — those are distributions: the kernel + tools + a package manager, bundled for humans
- Different distro, same kernel underneath
Tip: Once this clicks, a lot of the "why are there so many versions of Linux" confusion disappears.
2. Revisiting the Terminal, Properly This Time
I'd used a terminal before, but mostly copy-pasting commands without really knowing what they did. This time I slowed down:
pwd # where am I
ls # what's here
cd # move around
mkdir # make a folder
touch # make a file
cat # read a file
Tip: There's a difference between running a command because a tutorial told you to, and running it because you know exactly what it'll do. That's the gap I was closing.
3. Package Managers Aren't All the Same
- Debian-based (Ubuntu, Mint) →
.deb packages via apt / dpkg
- RPM-based (Fedora, RHEL) →
.rpm packages via yum / rpm
Tip: A package manager's real job isn't "install this" — it's quietly handling dependencies so what you install actually runs.
Coming from cybersecurity, this chapter felt like home — but it still reframed a few things:
- Root privileges — know who has them and why
- Strong passwords + 2FA
- Permissions done right
- Ubuntu's UFW for firewalls (Gufw if you want it with a GUI)
Tip: Good security is a habit you practice, not a tool you install once.
5. Virtualization — The Concept Behind Half of Modern Tech
- One physical machine (host) runs several virtual machines (guests)
- A hypervisor manages them
- Same underlying instinct behind Docker and Kubernetes — don't waste hardware on one job
Tip: This is exactly why you run tools in a VM instead of your main OS — a lesson every cybersecurity person learns the hard way eventually.
The Real Takeaway
The concepts weren't the hard part for me — the vocabulary review was. Kernel, shell, hypervisor, dependency, distro. Going back to the fundamentals as someone who already "knew" Linux was humbling in a good way. It's easy to skip the basics when you can already get things done. Going back and actually understanding why things work made all the difference.
18 chapters and a bunch of labs still ahead. I'll be documenting this properly from here — so consider this Part 1.
Stay curious, stay consistent
The Duchess of Hackers
Full-Stack Developer | Digital Marketer | Cybersecurity Enthusiast
