  This is a partly non-technical introduction to selected topics on tensor
network methods, based on several lectures and introductory seminars given on
the subject. It should be a good place for newcomers to get familiarized with
some of the key ideas in the field, specially regarding the numerics. After a
very general introduction we motivate the concept of tensor network and provide
several examples. We then move on to explain some basics about Matrix Product
States (MPS) and Projected Entangled Pair States (PEPS). Selected details on
some of the associated numerical methods for 1d and 2d quantum lattice systems
are also discussed.
