ocw.mit.edu
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MIT OpenCourseWare provides free, openly accessible course materials from MIT across a wide range of subjects. The site offers lecture notes, assignments, exams, and sometimes video lectures, enabling self-paced study of topics such as mathematics and probability, including sigma-algebras.
More resources on Sigma-Algebras
Frederic Schuller Lectures Playlist
Full free video lectures on measure theory foundations, practitioner favorite on Reddit.
Measure and Integration
Learn sigma-algebras and measure theory with this course from Piotr Mikusinski. Explore integration concepts and applications.
mathworld.wolfram.com
MathWorld is a comprehensive online mathematics encyclopedia by Wolfram Research that offers detailed, well-structured articles on a wide range of math topics. It includes entries on sigma-algebras—covering definitions, key properties, and examples—and links to related probability and measure-theory concepts.
nptel.ac.in
NPTEL is a free online learning platform run by IITs that offers lecture videos, course materials, and quizzes across engineering, sciences, and humanities. It includes probability theory content (such as sigma-algebras) and related topics through structured courses and tutorials.