Tech Visuals 101

Learn developer tools, Linux, networking, DevOps, security, databases, APIs, and cloud concepts through visuals and simple explanations.

This repository is a collection of visual cheat sheets and infographics for developers, sysadmins, DevOps engineers, security learners, and anyone who wants to understand modern computing concepts faster.

Topics

Linux and Command Line

  • Linux commands
  • Linux directory structure
  • Linux file permissions
  • Linux file types
  • Linux boot process
  • Linux architecture
  • Linux shells
  • Bash scripting
  • Bash loops, functions, brackets, and parameter expansion
  • Cron
  • Grep, awk, sed, find, tar, curl, less, vim, netcat, nmcli
  • Redirection and pipes
  • Process management
  • Logical Volume Manager
  • ACLs, UFW, iptables, autofs

Networking and Protocols

  • OSI vs TCP/IP
  • Network protocol stack
  • Common network protocols
  • DNS and DNS record types
  • DHCP, ARP, GARP, NAT, NTP, SNMP
  • IPv4 vs IPv6
  • TCP three-way handshake
  • HTTP status codes
  • HTTP/2 vs HTTP/3
  • Traceroute
  • Routing schemes
  • VLAN port types
  • MAC addresses
  • Email protocols

Git, Docker, and Kubernetes

  • Git fundamentals
  • Git workflow
  • Git commands
  • Git merge vs rebase vs cherry-pick
  • How Git works
  • Docker cheat sheets
  • How Docker works
  • Docker components
  • Containers vs VMs
  • Kubernetes components
  • Kubernetes scaling strategies

DevOps and Cloud

  • DevOps concepts
  • DevOps tools
  • Ansible architecture
  • Cloud platform models
  • Types of servers
  • Server hardening
  • Admin tips
  • Log parsing commands

Security and Cryptography

  • Cybersecurity roadmap
  • SSH and SSH server hardening
  • TLS/SSL handshake
  • Public key cryptography
  • Digital signatures
  • Encryption types
  • SPF, DKIM, and DMARC
  • Tokens vs APIs

Databases and APIs

  • SQL cheat sheet
  • SQL joins
  • Common database types
  • Main database types
  • API architecture styles
  • REST API design

Browse the Files

The visuals are available in image and PDF formats: