nptel.ac.in
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NPTEL is an Indian online learning platform offering video lectures, notes, assignments, and certificates across engineering and sciences, including courses on probability and statistics that cover distributions.
More resources on Distributions
mathworld.wolfram.com
MathWorld is a comprehensive online mathematics encyclopedia from Wolfram Research. It offers in-depth articles, definitions, formulas, and visual explanations on a wide range of topics, including detailed entries on probability distributions with properties, formulas (PDFs/CDFs), and related concepts.
ocw.mit.edu
MIT OpenCourseWare (OCW) offers free, openly accessible course materials from MIT, including lecture notes, assignments, and exams across a wide range of subjects. It serves as a comprehensive self-study resource, with courses in mathematics, statistics, probability, and related fields covering foundational concepts and practical problem sets.