ocw.mit.edu
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MIT OpenCourseWare provides free, openly licensed course materials from MIT for self-study. Browse math, science, and engineering courses to access syllabi, lecture notes, problem sets, exams, and, in some cases, video lectures from actual MIT classes.
More resources on Sobolev Spaces
mathworld.wolfram.com
MathWorld is Wolfram's comprehensive online mathematics encyclopedia offering in-depth articles, definitions, formulas, and explanations on a wide range of topics. It includes entries on Sobolev spaces with related theorems, examples, and references.
nptel.ac.in
NPTEL is a government-backed Indian online learning platform from IITs and IISc that hosts free and paid courses, offering video lectures, lecture notes, assignments, and quizzes. It covers engineering, science, and mathematics, including advanced topics like Sobolev spaces within its course catalog.