Introduction to the Proceedings of WGTTG2021

We describe the Italy-South Africa Research Program 2018--2020, focusing on the mobility scheme ``Algebraic Graph Theory and Complex Networks'' which supported a series of scientific initiatives between the University of Cape Town (Cape Town, South Africa) and the University of Naples Federico II (Naples, Italy) during the years 2018--2021. We sketch the relevant steps of the collaboration, focusing on the creation of a network of researchers between Italy and South Africa in the fields of Graph Theory and Combinatorics. In this context it becomes more relevant the role of the ``Workshop on Graphs, Topology and Topological Groups 2021'' and of the corresponding proceedings.