Links
Online seminar directory: https://researchseminars.org/
John McCammond's Geometric Group Theory page.
Generating functions: https://www.cs.auckland.ac.nz/~mcw/Research/mvGF/
Nilpotent notes: https://sites.tufts.edu/natefisher/files/2019/03/nilpotent-natemoon.pdf
Probability and Geometry and Groups: https://math.bme.hu/~gabor/PGG.pdf