Reference Guides
Cheat Sheets
Single-screen reference guides for coding interviews, system design, networking, and Linux. Everything you need, visible at a glance.
Claude Code Cheat Sheet
Every slash command, keyboard shortcut, CLI flag, permission mode, hook, MCP config, and IDE integration. Searchable.
80+ commandsBig O Cheat Sheet
Time and space complexity for every data structure, sorting algorithm, and graph algorithm, with visual charts.
12 data structuresSystem Design Cheat Sheet
Load balancing, caching, databases, message queues, API design, microservices patterns, consistency models, and key numbers.
12 topicsSubnet Cheat Sheet
CIDR notation, subnet masks, usable hosts, private IP ranges, VLSM, wildcard masks, IPv6, and calculation shortcuts.
14 sectionsLinux Cheat Sheet
File permissions, I/O redirection, grep/sed/awk, process management, networking, systemd, cron, and shell shortcuts.
12 sectionsLinux Commands Cheat Sheet
Every command organized by task. Top 20 commands, file ops, search, text processing, networking, processes, permissions, and one-liners.
200+ commandsAWS ETL Tools Cheat Sheet
Compare AWS Glue, EMR, Athena, Kinesis Firehose, and DMS. Architecture, pricing, hidden traps, and copy-paste CLI snippets.
5 AWS servicesProgramming Interview Cheat Sheet
Problem-solving framework, pattern recognition, code templates (BFS, DFS, sliding window, binary search, DP, backtracking), edge cases, and interview strategy.
15 patterns