Everything starts with understanding why

Everything you need to know about virtual machines, operating systems, Linux, servers, kernels, SSH, and essential terminal commands — explained with real-world analogies.

How computers talk to each other — from IP addresses and DHCP to NAT, SSH tunnels, SCP file transfers, and VM networking. The concepts every engineer needs to understand.

What Bash actually is, how files and directories work, the Linux filesystem structure, the root user, switching users with su, and mastering the ls command family.

Linux file permissions demystified — who can read, write, and execute files, how chmod numbers work, reading ls -l output, SSH permission requirements, and advanced SUID/SGID/Sticky bits.