These slides are for a lecture “Network analysis”, of 851-0585-38L Data Science in Techno-Socio-Economic Systems course presented in the spring semester 2021 at ETH Zurich. The goal of this lecture was to give a short introduction to network science tools for analysis of networked data and to present network modelling that can help better understand the data of interest. The lecture covers basic network science concepts, network models, community detection, and discusses limitations of network science, ending with a presentation of simplicial complexes as a generalisation of networks. Vaiva Vasiliauskaite Professorship of Computational Social Science, ETH vvasiliau@ethz.ch