# Prometheus
All Prometheus notes →1 — PromQL Cheat Sheet
A grouped, copy-paste reference of node_exporter PromQL queries for CPU, memory, disk, network, swap, inode, and TCP socket questions.
4 — Exporter Catalog
A lookup table of exporters covered in this book — key metrics, metric types, and what each metric tells you — for the two exporters with real worked examples in the source material.
5 — Prometheus Configuration Reference
A field-by-field reference for prometheus.yml — global settings, scrape_configs options, and worked examples pulled from real multi-job configurations.
6 — Common Anti-Patterns
Three concrete Prometheus anti-patterns seen in this book's source material — high-cardinality labels, invalid/reserved metric naming, and misaligned histogram_quantile buckets — with why each one breaks and where to read the full explanation.
2 — Recording Rule Cookbook
A cookbook of distinct, ready-to-paste recording rule patterns — currently the only worked examples in this book's source material are already the teaching example in Advanced PromQL, so there isn't yet a second, genuinely different set of recipes.
3 — Alert Rule Cookbook
A cookbook of ready-to-use Prometheus alerting-rule YAML patterns — currently only one worked example exists in this book's source material (the SLO-breach alert in Alerting Rules, Part 06), not yet enough distinct patterns to call this a genuine cookbook.
7 — PCA Exam Cheat Sheet
A condensed one-page PCA exam reference — pending the exam objectives chapter this depends on.
8 — Interview Cheat Sheet
A condensed one-page interview-prep reference — pending the interview-question bank this depends on.
# Dbms
All Dbms notes →1 — SQL Cheat Sheet
A quick-reference cheat sheet of SQL syntax across DDL, DML, joins, aggregation, and window functions.
10 — MySQL EXPLAIN Cheat Sheet
A quick-reference cheat sheet for reading MySQL EXPLAIN output.
11 — Top 200 MAANG DBMS Interview Questions
A running list of the top 200 DBMS interview questions asked at MAANG-tier companies.
12 — DBMS Glossary
A glossary of core DBMS terminology used throughout this book.
13 — Further Reading
A curated list of papers, books, and blogs for going deeper on database internals.
2 — Relational Algebra Cheat Sheet
A quick-reference cheat sheet of relational algebra operators and their SQL equivalents.
3 — Normalization Cheat Sheet
A quick-reference cheat sheet of the normal forms and the anomaly each one eliminates.
4 — Isolation Levels Matrix
A matrix cross-referencing isolation levels against the concurrency anomalies each one permits or prevents.
5 — Lock Compatibility Matrix
A compatibility matrix for lock modes used in concurrency control.
6 — Join Algorithms Comparison
A side-by-side comparison of join algorithms and their cost characteristics.
7 — Index Selection Guide
A decision guide for choosing an index type and columns for a given query pattern.
8 — Database Selection Decision Matrix
A decision matrix for choosing between SQL and NoSQL databases based on workload characteristics.
9 — PostgreSQL EXPLAIN Cheat Sheet
A quick-reference cheat sheet for reading PostgreSQL EXPLAIN and EXPLAIN ANALYZE output.
# Infrastructure Platform Engineering
All Infrastructure Platform Engineering notes →1 — Infrastructure Platform Reference Architecture
A reference architecture diagram and component breakdown for a complete infrastructure platform.
2 — Terraform/OpenTofu Project Structures
Reference project structures for organizing Terraform/OpenTofu code at module, workload, and enterprise scale.
3 — Enterprise Landing Zone Reference Models
Reference landing zone models for enterprise cloud account/subscription structures.
4 — Module Design Best Practices
A best-practices checklist for designing reusable, enterprise-grade infrastructure modules.
5 — Infrastructure Maturity Assessment
A self-assessment rubric for scoring an organization's infrastructure platform maturity.
6 — Cloud Architecture Decision Records (ADRs)
Reference ADR templates and examples for capturing cloud architecture decisions.
7 — Infrastructure Platform Patterns & Checklists
A consolidated reference of infrastructure platform patterns and operational checklists.
# Networks
All Networks notes →1 — Common Ports
A reference table of common ports across the 20–65535 range and the services conventionally bound to them.
10 — Wireshark Filters
A cheat sheet of commonly used Wireshark display filters for isolating traffic during packet analysis.
11 — tcpdump Cheat Sheet
A cheat sheet of common tcpdump invocations and filter expressions for capturing traffic from the command line.
12 — curl Cheat Sheet
A cheat sheet of common curl flags and invocations for debugging HTTP requests from the command line.
13 — Linux Networking Commands
A consolidated command reference for Linux networking tools — ss, ip, netstat, route, traceroute, and ping.
14 — Kubernetes Networking Commands
A consolidated command reference for debugging Kubernetes networking — kubectl exec, ephemeral containers, and Cilium monitor.
15 — Cloud Networking Terminology
A glossary of cloud networking terminology — VPC, VNet, NSG, peering, and related terms — for quick lookup across cloud providers.
16 — Common Interview Pitfalls
A list of common networking interview pitfalls and the misconceptions behind each one.
2 — HTTP Status Codes
A reference table of HTTP status codes grouped by class, with what each one actually signals.
3 — TCP Flags
A reference table of the TCP header's control flags — SYN, ACK, FIN, RST, PSH, URG — and what each means in a packet capture.
4 — ICMP Message Types
A reference table of ICMP message types and codes, including the ones behind ping and traceroute.
5 — CIDR Cheat Sheet
A CIDR notation cheat sheet mapping prefix length to subnet size and usable host count.
6 — IPv4 Reserved Ranges
A reference table of reserved and special-use IPv4 address ranges — private ranges, loopback, link-local, and multicast.
7 — IPv6 Address Types
A reference table of IPv6 address types — unicast, multicast, anycast, link-local, and unique local — and how to recognize each.
8 — TLS Cipher Suites
A reference table of TLS cipher suites and what their naming convention actually encodes.
9 — DNS Record Types
A consolidated reference table of DNS record types for quick lookup alongside Part IV's DNS chapters.
# Object Oriented Programming
All Object Oriented Programming notes →1 — UML Class Diagrams
Reference appendix entry for sketching class diagrams — classes, attributes, methods, and relationship notation used throughout this book.
10 — 200+ MAANG OOP Interview Questions
Reference bank of 200+ OOP interview questions spanning conceptual, coding, and design-interview formats.
2 — UML Sequence Diagrams
Reference appendix entry for sequence diagrams — object interactions and message ordering over time.
3 — UML State Diagrams
Reference appendix entry for state diagrams — modeling object lifecycle and state transitions.
4 — UML Activity Diagrams
Reference appendix entry for activity diagrams — modeling control flow and business logic across objects.
5 — Common OOP Interview Pitfalls
Reference appendix entry cataloging recurring mistakes candidates make when applying OOP concepts under interview pressure.
6 — OOP Cheat Sheet
One-page reference summarizing every OOP concept covered in this book for rapid pre-interview review.
7 — SOLID Cheat Sheet
One-page reference summarizing the five SOLID principles and their interview-ready one-liners.
8 — Design Pattern Selection Matrix
Reference matrix mapping problem shapes to the GoF pattern that solves them, for quick pattern selection under interview time pressure.
9 — Language Feature Comparison
Side-by-side comparison of how Java, C#, C++, Python, and TypeScript implement core OOP features.
# Productivity
All Productivity notes →1 — Productivity Framework Cheat Sheets
One-page summaries of every named framework in this book — Eisenhower Matrix, GTD, PARA, Zettelkasten — for a fast lookup without re-reading the chapter.
10 — Engineering Productivity Toolkit
A checklist of tools and defaults referenced across Part 11 — linters, snippet managers, local dev loop shortcuts — kept as a single reference list.
2 — Planning Templates
The blank planning templates referenced across Part 02 and Part 14 — annual, quarterly, and weekly planning sheets in one place.
3 — Weekly Review Checklist
A condensed checklist version of the Weekly Review template in Part 14, for a faster end-of-week pass.
4 — Goal-Tracking Templates
Pointer to the Life Vision and Goal Progress journal templates in Part 02, the working goal-tracking artifacts this book actually uses.
5 — Habit Tracker Templates
Pointer to the Habit Tracker journal template in Part 09, the working habit-tracking artifact this book actually uses.
6 — Decision Journal Template
Pointer to the Decision Journal template in Part 08, the working decision-tracking artifact this book actually uses.
7 — Meeting Notes Template
A minimal template for capturing a meeting's decisions and owners — the artifact Part 10's Meeting Management chapter assumes exists.
8 — Reading Workflow
The end-to-end intake pipeline for a technical book — from queueing it to a note landing in the second brain — that Part 06's Reading Technical Books chapter assumes.
9 — Knowledge Capture Workflow
The step-by-step path an idea takes from a fleeting capture to a linked, atomic note — the mechanical process underneath Part 05.