PyG
https://pytorch-geometric.readthedocs.io/en/latest/get_started/introduction.html
https://pytorch-geometric.readthedocs.io/en/latest/get_started/colabs.html
Basic example:
https://github.com/tkipf/pygcn/tree/master
NeworkX
https://networkx.org/documentation/stable/tutorial.html
Others
https://ogb.stanford.edu/
https://www.dgl.ai/