Developer Cheatsheets

Quick reference guides for development, interviews & system design

118 Cheatsheets

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Languages

Types, generics, utility types, advanced patterns, async, decorators, and tsconfig.

Goroutines, channels, interfaces, structs, error handling, concurrency, and modules.

Python — Interview

Data structures, algorithms, complexity, built-in functions, OOP, and common patterns.

Python — Development

FastAPI, SQLAlchemy, async, packaging, testing, typing, decorators, and project structure.

Strings, arrays, hashes, blocks, OOP, modules, enumerable, file I/O, and Rails essentials.

Ownership, borrowing, lifetimes, structs, enums, traits, pattern matching, and Cargo.

Optionals, collections, closures, protocols, async/await, actors, and SwiftUI basics.

ES6+, closures, promises, async/await, DOM manipulation, modules & event loop.

Pointers, memory management, structs, preprocessor directives, I/O & standard library.

Classes, templates, STL, smart pointers, RAII, move semantics & modern C++ features.

LINQ, async/await, generics, delegates, events, .NET runtime & Entity Framework.

Null safety, coroutines, data classes, sealed classes, extensions & Android basics.

Classes, null safety, async/await, collections, mixins, Flutter basics & packages.

Arrays, OOP, PDO, Composer, sessions, error handling & common functions.

Matrices, plotting, functions, toolboxes, Simulink basics & data analysis.

Document structure, math typesetting, bibliographies, tables, figures & packages.

Semantic elements, forms, attributes, meta tags, accessibility & best practices.

Variables, nesting, mixins, extends, functions, partials & SCSS syntax.

Java Ecosystem

Java + Spring Boot

REST APIs, JPA, Security, dependency injection, annotations, testing, and configuration.

Java Collections

List, Set, Map, Queue, Stack, Streams API, String methods, Arrays, Optional, and java.time.

Backend Frameworks

FastAPI + UV Python

UV package manager, venv, FastAPI routes, Pydantic, auth, SQLAlchemy, and Docker deployment.

Routing, middleware, request binding, JWT auth, GORM database, validation, and testing.

Models, ORM, views, forms, auth, Django REST Framework, Blueprints, and SQLAlchemy.

TS Backend Frameworks

Express, Hono, Elysia, NestJS, tRPC, oRPC, Bun — routes, middleware, and type-safe APIs.

Routing, middleware, request/response, error handling, templating & REST APIs.

Routing, Eloquent ORM, Blade templates, middleware, auth & artisan commands.

Frontend & CSS

React, Vue, Nuxt, Svelte

React hooks & patterns, Vue 3 Composition API, Nuxt 3, Svelte 5 runes, and state management.

Selectors, box model, flexbox, grid, animations, responsive design, and everyday patterns.

Selectors, DOM manipulation, events, AJAX, animations & plugin development.

Arrow functions, destructuring, spread/rest, template literals, modules & iterators.

Template syntax, partials, includes, loops, conditionals & Express integration.

Components, state management, routing, templates & reactive data binding.

Queries, mutations, subscriptions, schema design, resolvers & Apollo basics.

Databases & ORMs

Schema design, joins, indexes, transactions, window functions, JSON, CTEs, and performance tuning.

MongoDB CRUD & aggregation, Redis data types & caching patterns, DynamoDB, and when to use what.

Drizzle & Prisma

Schema definition, CRUD queries, relations, migrations, Drizzle Studio, and Prisma Client.

CRUD operations, aggregation pipeline, indexes, schema design & Mongoose.

Cypher queries, nodes, relationships, patterns, indexes & graph algorithms.

Data types, commands, pub/sub, caching patterns, persistence & Lua scripting.

DDL, DML, joins, indexes, stored procedures, triggers & performance tuning.

Security & Auth

OAuth & Auth Concepts

OAuth 2.0 flows, OIDC, JWT claims, JWKS, PKCE, token management, and security best practices.

TypeScript auth library — email/password, OAuth providers, sessions, 2FA, plugins, and Next.js integration.

Computer Science

Algorithms & Sorting

Sorting algorithms, binary search, BFS/DFS, dynamic programming, greedy, and backtracking.

Scaling, load balancers, caching, CAP theorem, message queues, microservices, and common designs.

Processes, threads, CPU scheduling, memory management, deadlocks, file systems, and networking.

AI & Tools

Prompt engineering, token optimization, RAG, embeddings, API usage, and evaluation metrics.

Prompt engineering, system prompts, API usage, plugins, GPTs & best practices.

Voice assistant, intents, scripts, actions, visual state & integration.

AI tools collection, categories, use cases, comparisons & recommendations.

Data & ML

Data Engineering

Snowflake, PySpark, Pandas, Polars, Airflow, dbt, Kafka, ETL/ELT, data modeling & warehouse.

NumPy, Pandas, Matplotlib, Seaborn, statistics, EDA, feature engineering & scikit-learn.

AI & ML Development

PyTorch, TensorFlow, CNNs, RNNs, Transformers, Hugging Face, MLOps & GPU training.

Python Tricks & Interviews

Matrix input, one-liners, collections, itertools, bitwise tricks, sorting & interview patterns.

Arrays, indexing, broadcasting, linear algebra, random & mathematical functions.

Tensors, autograd, neural networks, training loops, datasets & GPU acceleration.

Data Formats

Syntax, data types, nested structures, JSON Schema, parsing & serialization.

Syntax, anchors, aliases, multi-line strings, sequences & mappings.

Tables, arrays, inline tables, date/time, strings & configuration patterns.

Sections, key-value pairs, comments, multi-line values & common patterns.

Headings, lists, links, images, tables, code blocks & GitHub Flavored Markdown.

DevOps & Toolkit

Dockerfile, images, containers, volumes, networking, compose & best practices.

Pods, deployments, services, configmaps, secrets, ingress & kubectl commands.

Install, update, search, taps, casks, services & formula management.

Shortcuts, extensions, settings, debugging, tasks, snippets & keybindings.

Buffers, windows, keybindings, modes, org-mode, packages & configuration.

Modes, motions, commands, registers, macros, splits & plugin management.

Abbreviations, nesting, multiplication, grouping, attributes & CSS shortcuts.

Interception, flows, filters, scripting, certificates & HTTP debugging.

Axes, predicates, functions, expressions, node selection & XQuery basics.

Process management, clustering, logs, monitoring, deployment & ecosystem file.

Requests, collections, environments, tests, variables & API documentation.

Linux Commands

Variables, loops, conditionals, functions, pipes, redirection & scripting patterns.

Branches, commits, merge, rebase, stash, reset, log, remote & workflows.

Character classes, quantifiers, groups, lookahead, backreferences & common patterns.

Patterns, actions, fields, built-in variables, functions & text processing.

Substitution, deletion, insertion, addresses, hold space & text transformation.

Pattern matching, regex, flags, recursive search, context & common options.

HTTP methods, headers, auth, cookies, file upload/download & API testing.

Key generation, config file, tunneling, port forwarding, SCP & agent forwarding.

Sessions, windows, panes, keybindings, copy mode & configuration.

Sessions, windows, splitting, detach/attach, scrollback & configuration.

File search, predicates, actions, -exec, -name, -type & common patterns.

Permissions, octal notation, symbolic mode, recursive & special bits.

Crontab syntax, schedule expressions, common schedules, logging & best practices.

List open files, network connections, processes, sockets & file descriptors.

Network statistics, connections, routing tables, interfaces & listening ports.

TCP/UDP connections, port scanning, file transfer, chat & network debugging.

CPU affinity, process binding, core masks & performance tuning.

Document conversion, formats, templates, filters & citation processing.

Keyboard Shortcuts

Adobe Photoshop

Layers, selection, brushes, filters, transform & essential shortcuts.

Movement, combat, abilities, pings, inventory & key bindings.

Selection, frames, components, prototyping, layers & essential shortcuts.

Microsoft Teams

Navigation, chat, meetings, calls, commands & essential shortcuts.

Navigation, queries, tabs, connections, data editing & essential shortcuts.

Notes, formatting, tags, search, export & essential shortcuts.

Navigation, articles, boards, tags, search & essential shortcuts.

Connections, file transfer, navigation, bookmarks & essential shortcuts.

Navigation, voting, comments, subreddits & essential shortcuts.

Navigation, messaging, channels, search, calls & essential shortcuts.

Playback, navigation, playlists, likes & essential shortcuts.

Navigation, tweets, timeline, search, DMs & essential shortcuts.

Navigation, editing, refactoring, debugging, build & essential shortcuts.

Navigation, pull requests, issues, code review & essential shortcuts.

Admin navigation, products, orders, themes & essential shortcuts.

Meeting controls, chat, screen sharing, recording & essential shortcuts.

Design, prototyping, layers, artboards, components & essential shortcuts.

Tabs, navigation, bookmarks, dev tools, search & essential shortcuts.

Navigation, editing, refactoring, debugging, VCS & essential shortcuts.

Reference

Operators, filters, site search, date range, file type & advanced tips.

HTTP Status Codes

1xx–5xx codes, descriptions, common codes, REST conventions & error handling.

Character table, control codes, printable characters & encoding reference.

HTML Character Entities

Special characters, symbols, arrows, math operators & named entities.

Unicode emoji, categories, skin tones, ZWJ sequences & shortcodes.

Content types, categories, common types, file extensions & registration.

ISO 639-1 Language Codes

Language codes, country codes, locale identifiers & i18n reference.

Common ratios, resolutions, screen sizes, video formats & calculations.

Screen Resolutions

Display sizes, pixel densities, aspect ratios & responsive breakpoints.

Quick reference collection, links, categories & navigation tips.