Power BI Guided Learning (Microsoft)
Step-by-step tutorials directly from Microsoft, teaching data connection, modeling, visualization, and publishing dashboards.
Kasper On BI
Blog by a Microsoft program manager sharing deep-dive explanations of Power BI features and integrations with Azure and Excel.
LearnPython.org
Interactive, browser-based Python tutorials ranging from basic syntax to advanced modules.
Art of Problem Solving (AoPS) Online Resources
Challenging problems, explanations, and articles designed for advanced high school and college-level students interested in problem solving and Olympiad-style math.
HackerRank SQL Domain
SQL challenges of varying difficulty levels with instant online feedback, great for structured practice.
Naval War College ? Research & Wargaming
Institutional hub for naval and joint wargaming?education, research collaborations, and sponsor-driven games.
Analytics Vidhya
Wide range of free tutorials, guides, and case studies on data analytics, machine learning, and business intelligence.
W3Schools Python
Step-by-step interactive lessons for Python basics, data structures, and functions, with hands-on coding snippets.
Programiz Python
Beginner-friendly tutorials covering Python basics, data structures, object-oriented programming, and standard libraries.
Manhattan Review Free GRE Resources
Free practice problems, diagnostic tests, and study tips from test prep experts.
MiT Open CourseWare
MIT OpenCourseWare offers free access to thousands of MIT course materials?lectures, assignments, and exams?covering subjects from engineering and computer science to economics and the humanities. It's open learning at its best, with no registration required.
Enterprise DNA Blog
Tutorials and case studies focused on practical Power BI usage, advanced DAX, and visualization techniques.
R-Bloggers
Aggregator of hundreds of blogs covering R tutorials, packages, and real-world data science applications.
SQLite Tutorial
Focused tutorials on SQLite, covering SQL basics, database management, and practical coding examples.
Microsoft Learn - Data Analysis
Free learning paths covering data analysis basics and Power BI dashboards directly from Microsoft.
OpenIntro Statistics
Free, open-source statistics textbook with R labs and applied data analysis examples.
Why Machines Learn
Anil Ananthaswamy
A deep dive into the elegant mathematical principles behind machine learning
Stack Overflow - R Tag
A huge developer community answering detailed questions about R, packages, and applied statistics.
Tableau Public Resources
Free resources and tutorials for using Tableau to create interactive visualizations and dashboards.