I've always been a language enthusiast, both for "people" languages as well as computer languages. Most of what I know is through experience or, as my wife puts it, "reading random stuff on the Internet". On the downside, my attention span is only slightly better than that of a five-year-old who's just arrived at Disney World.
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Game Development
Q&A for professional and independent game developers
Worldbuilding
Q&A for writers/artists using science, geography and culture to construct imaginary worlds and settings
English Language Learners
Q&A for speakers of other languages learning English
Puzzling
Q&A for those who create, solve, and study puzzles
Physics
Q&A for active researchers, academics and students of physics
Science Fiction & Fantasy
Q&A for science fiction and fantasy enthusiasts
Bricks
Q&A for LEGO® and building block enthusiasts
Stack Overflow
Q&A for professional and enthusiast programmers
Personal Finance & Money
Q&A for people who want to be financially literate
Parenting
Q&A for parents, grandparents, nannies and others with a parenting role
Retrocomputing
Q&A for vintage-computer hobbyists interested in restoring, preserving, and using the classic computer and gaming systems of yesteryear
Software Recommendations
Q&A for people seeking specific software recommendations
Super User
Q&A for computer enthusiasts and power users
Graphic Design
Q&A for Graphic Design professionals, students, and enthusiasts
Arqade
Q&A for passionate videogamers on all platforms
Role-playing Games
Q&A for gamemasters and players of tabletop, paper-and-pencil role-playing games
Server Fault
Q&A for system and network administrators
Home Improvement
Q&A for contractors and serious DIYers
Electrical Engineering
Q&A for electronics and electrical engineering professionals, students, and enthusiasts
Bitcoin
Q&A for Bitcoin users, developers, and enthusiasts
Quantitative Finance
Q&A for finance professionals and academics
Matter Modeling
Q&A for materials modelers and data scientists
Martial Arts
Q&A for students and teachers of all martial arts
Vi and Vim
Q&A for people using the vi and Vim families of text editors
Japanese Language
Q&A for students, teachers, and linguists wanting to discuss the finer points of the Japanese language
Computer Graphics
Q&A for computer graphics researchers and programmers
Software Engineering
Q&A for professionals, academics, and students working within the systems development life cycle
History of Science and Mathematics
Q&A for people interested in the history and origins of science and mathematics
Philosophy
Q&A for those interested in the study of the fundamental nature of knowledge, reality, and existence
Pets
Q&A for pet owners, caretakers, breeders, veterinarians, and trainers
Signal Processing
Q&A for practitioners of the art and science of signal, image and video processing
Engineering
Q&A for professionals and students of engineering
Database Administrators
Q&A for database professionals who wish to improve their database skills and learn from others in the community
Chinese Language
Q&A for students, teachers, and linguists wanting to discuss the finer points of the Chinese language
Lifehacks
Q&A for people looking to bypass life's everyday problems with simple tricks
Data Science
Q&A for Data science professionals, Machine Learning specialists, and those interested in learning more about the field
Christianity
Q&A for committed Christians, experts in Christianity and those interested in learning more
Latin Language
Q&A for linguists, teachers, and students wanting to discuss the finer points of the Latin language
Bicycles
Q&A for people who build and repair bicycles, people who train cycling, or commute on bicycles
Ask Different
Q&A for power users of Apple hardware and software
Board & Card Games
Q&A for people who like playing board games, designing board games or modifying the rules of existing board games
Literature
Q&A for scholars and enthusiasts of literature
Drones and Model Aircraft
Q&A for experienced flyers, pilots, and builders of drones and model aircraft
Genealogy & Family History
Q&A for expert genealogists and people interested in genealogy or family history
Ethereum
Q&A for users of Ethereum, the decentralized application platform and smart contract enabled blockchain
Ukrainian Language
Q&A for linguists, teachers and students of the Ukrainian language
CiviCRM
Q&A for administrators and users of the CiviCRM Constituent Relationship Management software
Poker
Q&A for serious players and enthusiasts of poker
Drupal Answers
Q&A for Drupal developers and administrators
Expatriates
Q&A for people living abroad on a long-term basis
Operations Research
Q&A for operations research and analytics professionals, educators, and students
Computer Science Educators
Q&A for those involved in the field of teaching Computer Science
Computational Science
Q&A for scientists using computers to solve scientific problems
Open Source
Q&A for people organizing, marketing or licensing open source development projects
Geographic Information Systems
Q&A for cartographers, geographers and GIS professionals
Woodworking
Q&A for professional and amateur woodworkers
Sustainable Living
Q&A for folks dedicated to a lifestyle that can be maintained indefinitely without depleting available resources
French Language
Q&A for students, teachers, and linguists wanting to discuss the finer points of the French language
Sports
Q&A for participants in team and individual sport activities
Emacs
Q&A for those using, extending or developing Emacs
Blender
Q&A for people who use Blender to create 3D graphics, animations, or games
Robotics
Q&A for professional robotic engineers, hobbyists, researchers and students
Arduino
Q&A for developers of open-source hardware and software that is compatible with Arduino
Freelancing
Q&A for self-employed and freelance workers
Software Quality Assurance & Testing
Q&A for software quality control experts, automation engineers, and software testers
Biblical Hermeneutics
Q&A for professors, theologians, and those interested in exegetical analysis of biblical texts
Русский язык
Cайт вопросов и ответов для лингвистов и энтузиастов русского языка
Hinduism
Q&A for followers of the Hindu religion and those interested in learning more about Hinduism
Salesforce
Q&A for Salesforce administrators, implementation experts, developers and anybody in-between
The Great Outdoors
Q&A for people who love being outdoors enjoying nature and wilderness, and learning about the required skills and equipment
Biology
Q&A for biology researchers, academics, and students
Computer Science
Q&A for students, researchers and practitioners of computer science
Cryptography
Q&A for software developers, mathematicians and others interested in cryptography
Law
Q&A for legal professionals, students, and others with experience or interest in law
Mathematics Educators
Q&A for those involved in the field of teaching mathematics
Russian Language
Q&A for students, teachers, and linguists wanting to discuss the finer points of the Russian language
Writing
Q&A for the craft of professional writing, including fiction, non-fiction, technical, scholarly, and commercial writing
Chess
Q&A for serious players and enthusiasts of chess
Artificial Intelligence
Q&A for people interested in conceptual questions about life and challenges in a world where "cognitive" functions can be mimicked in purely digital environment
Politics
Q&A for people interested in governments, policies, and political processes
Music: Practice & Theory
Q&A for musicians, students, and enthusiasts
MathOverflow
Q&A for professional mathematicians
Seasoned Advice
Q&A for professional and amateur chefs
Android Enthusiasts
Q&A for enthusiasts and power users of the Android operating system
Aviation
Q&A for aircraft pilots, mechanics, and enthusiasts
Information Security
Q&A for information security professionals
SharePoint
Q&A for SharePoint enthusiasts
Travel
Q&A for road warriors and seasoned travelers
User Experience
Q&A for user experience researchers and experts
Linguistics
Q&A for professional linguists and others with an interest in linguistic research and theory
The Workplace
Q&A for members of the workforce navigating the professional setting
Code Golf
Q&A for programming puzzle enthusiasts and code golfers
Code Review
Q&A for peer programmer code reviews
Photography
Q&A for professional, enthusiast and amateur photographers
Physical Fitness
Q&A for physical fitness professionals, athletes, trainers, and those providing health-related needs
Space Exploration
Q&A for spacecraft operators, scientists, engineers, and enthusiasts
Earth Science
Q&A for those interested in the geology, meteorology, oceanography, and environmental sciences
Quantum Computing
Q&A for engineers, scientists, programmers, and computing professionals interested in quantum computing
Motor Vehicle Maintenance & Repair
Q&A for mechanics and DIY enthusiast owners of cars, trucks, and motorcycles
Economics
Q&A for those who study, teach, research and apply economics and econometrics
Mi Yodeya
Q&A for those who base their lives on Jewish law and tradition and anyone interested in learning more
Cross Validated
Q&A for people interested in statistics, machine learning, data analysis, data mining, and data visualization
Reverse Engineering
Q&A for researchers and developers who explore the principles of a system through analysis of its structure, function, and operation
Web Applications
Q&A for power users of web applications
Spanish Language
Q&A for linguists, teachers, students and Spanish language enthusiasts in general wanting to discuss the finer points of the language
Astronomy
Q&A for astronomers and astrophysicists
Buddhism
Q&A for people practicing or interested in Buddhist philosophy, teaching, and practice
Mathematica
Q&A for users of Wolfram Mathematica
TeX - LaTeX
Q&A for users of TeX, LaTeX, ConTeXt, and related typesetting systems
Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems
Mathematics
Q&A for people studying math at any level and professionals in related fields
Academia
Q&A for academics and those enrolled in higher education
German Language
Q&A for speakers of German wanting to discuss the finer points of the language and translation
Chemistry
Q&A for scientists, academics, teachers, and students in the field of chemistry
Raspberry Pi
Q&A for users and developers of hardware and software for Raspberry Pi
Veganism & Vegetarianism
Q&A for those committed to a vegan or vegetarian lifestyle and anyone interested in learning more
Ask Patents
Q&A for people interested in improving the patent system
GenAI
Q&A for GenAI enthusiasts and practitioners and those interested in learning more about using GenAI tools
Programming Language Design and Implementation
Q&A for designers and implementers of computer programming languages
Medical Sciences
Q&A for professionals in medical and allied health fields, students of those professions, related academics, and others with a sound understanding of medicine and healthcare-related sciences
Interpersonal Skills
Q&A for people looking to improve their interpersonal communication skills
Proof Assistants
Q&A for mathematicians and computer scientists who develop and use proof assistants
Meta Stack Exchange
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Stack Overflow на русском
Вопросы и ответы для программистов