WebsiteintermediateFree
ocw.mit.edu
Unknown
MIT OpenCourseWare (ocw.mit.edu) offers free, openly accessible course materials from MIT across many subjects, including mathematics. It hosts lecture notes, assignments, exams, and often lecture videos from actual courses, making it a useful resource for learning topics like cohomology.
More resources on Cohomology
WebsiteFree
Hatcher's Algebraic Topology
Free online book covering cohomology comprehensively
CourseFree
Algebraic Topology
Explore cohomology and other key concepts in algebraic topology with this course taught by Joe Harris.
WebsiteFree
nLab Cohomology
Reference page with AG-specific cohomology
WebsiteFree
Milne's Etale Cohomology Notes
Free PDF notes, highly recommended on Reddit
WebsiteFree
Stacks Project
Comprehensive free resource covering sheaf, etale cohomology in AG
CourseFree
Sheaf Cohomology
Learn Sheaf Cohomology with this course from the University of Bonn! Explore advanced cohomology topics.