Programming Cheat Sheets
Free, no-signup quick references for the languages and tools you use every day. Bookmark one, copy what you need, and try it live in the playground.
SQL Cheat SheetEvery SQL statement, clause, and join you reach for, on one page.Excel Cheat SheetEvery Excel formula, function, and shortcut you reach for, on one page.Python Cheat SheetPython syntax, data structures, and standard-library staples at a glance.Pandas Cheat SheetCreate, select, filter, clean, group, merge and plot DataFrames in pandas 3.NumPy Cheat SheetArrays, slicing, axis math, reshaping, random numbers and linear algebra in NumPy 2.Matplotlib Cheat SheetFigures and axes, every common plot type, labels, legends, subplots and styles.Scikit-learn Cheat SheetThe sklearn workflow: split, preprocess, fit, predict, score, pipelines and grid search.Git Cheat SheetThe Git commands you forget, from staging to rebasing to undo.Linux Commands Cheat SheetNavigate, search, and manage files from the Linux command line.JavaScript Cheat SheetModern JavaScript syntax, array methods, and async patterns on one page.TypeScript Cheat SheetTypeScript types, interfaces, generics, and utility types at a glance.Regex Cheat SheetRegular-expression tokens, quantifiers, groups, and lookarounds.HTML Cheat SheetEvery HTML tag and attribute you need, grouped by what it does.CSS Cheat SheetSelectors, the box model, flexbox, grid, and the properties you forget.Markdown Cheat SheetMarkdown and GitHub Flavored Markdown syntax, with what each line renders.Java Cheat SheetJava syntax, types, collections, and OOP keywords on one page.C++ Cheat SheetC++ syntax, the STL, pointers, references, and classes at a glance.C Cheat SheetC syntax, types, pointers, format specifiers, and the standard library.C# Cheat SheetC# syntax, types, LINQ, collections, and OOP keywords on one page.Go Cheat SheetGo syntax, slices, maps, structs, goroutines, and error handling.PHP Cheat SheetPHP syntax, arrays, strings, superglobals, and the functions you forget.Rust Cheat SheetRust syntax, ownership, borrowing, enums, traits, and pattern matching.Ruby Cheat SheetRuby syntax, blocks, arrays, hashes, and the methods you reach for.Swift Cheat SheetSwift syntax, optionals, collections, closures, and structs vs classes.Dart Cheat SheetDart syntax, null safety, collections, async, and classes at a glance.Lua Cheat SheetLua syntax, tables, functions, and the standard-library staples.GDScript Cheat SheetGDScript syntax, types, collections, classes, and signals for Godot 4.Pygame Cheat SheetThe game loop, drawing, Rect, sprites, collisions, input and sound for pygame.Luau Cheat SheetLuau's type syntax plus the operators and sugar Lua doesn't have.R Cheat SheetR syntax, vectors, data frames, and the data-wrangling staples.Verilog Cheat SheetVerilog HDL syntax, modules, always blocks, and operators.Solidity Cheat SheetSolidity syntax, types, mappings, modifiers, events, and errors.Kotlin Cheat SheetKotlin syntax, null safety, when, collections, and functions.Terminal Cheat SheetShell commands for navigation, files, pipes, and process control.
