Creating graph dataset for node classifications from csv file having user-user relationship

I am new in this field. I am following PyTorch geometric tutorial for creating my own graph dataset but
These tutorials are not enough for basic understanding. Can anyone suggest me something good for basic understanding. I want to perform node classification on user-user graph . and also need to build this graph first (very important) so it can be used by pytorch geometry lib for node classification
https://towardsdatascience.com/hands-on-graph-neural-networks-with-pytorch-pytorch-geometric-359487e221a8
https://pytorch-geometric.readthedocs.io/en/latest/notes/create_dataset.html

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