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ocw.mit.edu/prob
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MIT OpenCourseWare's Probability page offers free, openly licensed course materials from MIT's probability courses, including lecture notes, problem sets, exams, and (where available) video lectures. It provides resources to study foundational probability topics and practice with real problem sets.
More resources on Probability
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Bayes Theorem, the geometry of changing beliefs
3B1B video frequently linked in resource posts
CourseFree
Stat 110: Probability
Learn probability with Harvard's Stat 110, taught by Joseph Blitzstein. Master key concepts & problem-solving skills!
WebsiteFree
Probability Course
Free online textbook and resources
WebsiteFree
Seeing Theory
Interactive visualizations for probability and stats
VideoFree
Probability Distributions (StatQuest)
Clear explanations for data science practitioners
VideoFree
Essence of Probability (3Blue1Brown)
Visual intro to probability concepts, praised in data science threads