Topology
Tadashi Tokieda Lectures: https://www.youtube.com/watch?v=SXHHvoaSctc&list=PLTBqohhFNBE_09L0i-lf3fYXF5woAbrzJ
Snoopy-notes & Lia Vas notes: https://www.math.colostate.edu/~renzo/teaching/Topology10/Notes.pdf
https://liavas.net/courses/math430/