DataCamp (Free R Tutorials)

While DataCamp is subscription-based, it offers free introductory R courses covering basics, data manipulation, and visualization.

Tableau Public Resources

Free resources and tutorials for using Tableau to create interactive visualizations and dashboards.

Swirl: Learn R in R

An interactive R package that teaches R programming and data science concepts directly inside the R console.

Power BI Guided Learning (Microsoft)

Step-by-step tutorials directly from Microsoft, teaching data connection, modeling, visualization, and publishing dashboards.

Build a Large Language Model from Scratch

Charanpal Dhanjal

A hands-on guide to constructing your own LLM using modern machine learning techniques

Mode Analytics SQL & Analytics Tutorials

Hands-on tutorials that blend SQL queries with practical data analysis tasks for business analysts.

SQLBI

Extensive library of free articles, guides, and videos on DAX, data modeling, and BI concepts by expert consultants Alberto Ferrari and Marco Russo.

FreeCodeCamp - Data Analysis with Python

Full curriculum teaching Python for data analysis, including Pandas, NumPy, data cleaning, and visualization, with projects.

Manhattan Prep GRE Resources

Free GRE study materials, strategy guides, and practice question sets.

W3Schools Python

Step-by-step interactive lessons for Python basics, data structures, and functions, with hands-on coding snippets.

EDX ? Analyzing and Visualizing Data with Power BI (Audit Free)

University of Illinois & Microsoft course teaching Power BI for analytics and reporting, free in audit mode.

R for Data Science (Hadley Wickham & Garrett Grolemund)

A free online book teaching R through the tidyverse approach, covering data wrangling, visualization, and modeling.

CNA ? Gaming & Integration Program

Designs, facilitates, and analyzes sponsor-focused wargames for DoD and government decision-makers.

Mode SQL Tutorial

Practical SQL lessons taught in-browser, with real-world datasets and instant feedback for analysts.

Khan Academy - Intro to SQL

Beginner-friendly course teaching SQL fundamentals with practice problems and video explanations.

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.

Quick-R (StatMethods)

Practical R tutorials focused on statistics, graphics, and data analysis, written in a straightforward, example-driven style.

IBM Data Analyst Professional Certificate (Audit Free)

Covers data analysis with Excel, SQL, Python, and data visualization tools, including projects and case studies; free in audit mode.

Paul?s Online Math Notes

Comprehensive lecture notes, examples, and problem sets on calculus, differential equations, algebra, and more, written in an accessible format.