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01 — Linux Fundamentals

01 — Linux kernel and architecture
02 — Linux boot process
03 — Filesystem concepts
04 — Linux process model
05 — Users, groups, and permissions
06 — I/O, file descriptors, and streams
07 — Package management

02 — Shell Basics

01 — Shell environment and safe defaults
02 — Inspecting unknown content
03 — Text extraction and reshaping
04 — sed for streaming edits
05 — awk for fields and reports
06 — Sorting and deduplication
07 — Search basics (grep and ripgrep)
08 — Advanced grep, ripgrep, and regex
09 — Live log tailing
10 — jq for JSON
11 — yq for YAML
12 — Parallelism (xargs, parallel)
13 — Shell scripting structure

03 — Filesystem

01 — Finding files and metadata
02 — Filesystem literacy
03 — Comparing text and trees (diff / patch)
04 — Archives (tar)
05 — Compression tools

04 — Processes & Users

01 — Process listing and signals
02 — Users, groups, permissions
03 — Services (Linux, systemd)
04 — Scheduling: cron, crontab, launchd
05 — System introspection

05 — Networking Theory

01 — Well-known ports
02 — IP addressing and special ranges
03 — TCP and UDP fundamentals
04 — DNS record types and resolution
05 — IP routing fundamentals
06 — Application-layer protocols
07 — IPsec and VPN concepts

06 — Networking

01 — Local interfaces, routing, and ARP
02 — HTTP with curl
03 — Downloads with wget
04 — SSH config, keys, and agents
05 — rsync for sync
06 — DNS CLI (dig, host, nslookup)
07 — Reachability: ping, traceroute, mtr
08 — WHOIS-style text and registration fields
09 — TLS with openssl
10 — netcat / nc and socat
11 — tcpdump BPF basics and text output
12 — tshark decode workflows

07 — Exploitation

01 — nmap essentials
02 — Web content discovery
03 — CEWL-style wordlists
04 — Online brute-force tools
05 — High-speed scanning (masscan)

08 — Forensics

01 — Suspicious file analysis
02 — Web server log forensics
03 — Compromised host triage

Home Lab setup Stats Tools RTFM

Processes & Users

Covers process inspection and signals, file permissions and ownership, service management with systemd, scheduled tasks, and system introspection with ss and related tools. Work on the lab client host.

01 — Process listing and signals
02 — Users, groups, permissions
03 — Services (Linux, systemd)
04 — Scheduling: cron, crontab, launchd
05 — System introspection