Enterprise DNA Blog
Tutorials and case studies focused on practical Power BI usage, advanced DAX, and visualization techniques.
Mode Analytics SQL & Analytics Tutorials
Hands-on tutorials that blend SQL queries with practical data analysis tasks for business analysts.
ETS GRE Official Prep
Free official materials from ETS including practice questions, POWERPREP online practice tests, and test-taker tips.
UK Fight Club (Professional Wargaming Network)
Community that promotes professional military wargaming and simulation activities across UK defense.
Designing Machine Learning Systems
Chip Huyen
A practical blueprint for building production-ready ML systems with scalability and reliability
PAXsims (Conflict Simulation & Wargaming)
Long-running blog on serious games and wargaming for policy, education, and analysis with news, methods, and reviews.
Programiz Python
Beginner-friendly tutorials covering Python basics, data structures, object-oriented programming, and standard libraries.
Swirl: Learn R in R
An interactive R package that teaches R programming and data science concepts directly inside the R console.
RADACAD Power BI Blog
Practical tutorials and tips on Power BI modeling, DAX, Power Query, and real-world scenarios written by MVPs.
Build a Large Language Model from Scratch
Charanpal Dhanjal
A hands-on guide to constructing your own LLM using modern machine learning techniques
R-Bloggers
Aggregator of hundreds of blogs covering R tutorials, packages, and real-world data science applications.
OpenIntro Statistics
Free, open-source statistics textbook with R labs and applied data analysis examples.
OpenLearn - Learn to Code for Data Analysis
Free Open University course introducing Python programming in the context of data analysis.
Coursera - R Programming (Audit Free)
Johns Hopkins University?s R Programming course (part of the Data Science Specialization), free in audit mode with videos and quizzes.
Project Euler
Hundreds of challenging computational math problems that build problem-solving and programming skills.
Kaggle Learn R
Hands-on mini-courses for R programming, data visualization, and machine learning with interactive notebooks in the browser.
UC Berkeley Data 8 (Foundations of Data Science)
Introductory data science/analytics course using Python; includes lectures, labs, and exercises for free online.
FreeCodeCamp - Data Analysis with Python
Full curriculum teaching Python for data analysis, including Pandas, NumPy, data cleaning, and visualization, with projects.