Learn to analyze Linux disk usage using commands like ls, df -h, and du -h, inspect block devices, and isolate top space users while redirecting errors for concise summaries.

Explore basic port theory and how ports label information a computer exchanges, including ssh on port 22, http and https on ports 80 and 443, and email on port 25.

Use sudo iftop to monitor traffic on a selected interface, observe dns queries via pie hole, and review port activity and ssh login attempts for security awareness.

Discover why automated backups matter and how to simply copy your important files to a different location using available tools.

The lecture outlines the startup sequence from BIOS to the master boot record and kernel, then explains run levels, EFI, and GPT, with grub and systemd referenced.

Take a hands-on tour from compiling your own kernel to understanding systemd and service behavior, then explore System Rescue for booting with minimal system components when things go wrong.

Explore basic disk theory with a library-card analogy, covering partition tables, start-of-disk metadata, and why deletions affect entries rather than erase data.

Inspect partitions and verify filesystem layout with standard commands, confirming home on an extended filesystem, boot on its partition, and root on ZFS.

Replace the damaged disk in a degraded raid five array by adding a new disk, then let mdadm rebuild and monitor /proc/mdstat to verify recovery, all while maintaining backups.

Explain the basic concepts of software raid and hardware raid, including RAID 0, 1, 5, and 6, and differences in BIOS and server implementations.