1. Classical string theory
Channel: Marcus Berg
Date: 2017-04-25

String theory, video 1 of 15 (Polchinski Ch.1.2). Worldline formalism, Nambu-Goto action, minimal area surfaces, worldsheet metric, Polyakov action, symmetries, stress-energy tensor, Euler characteristic.
See https://tp.hotell.kau.se/marcus/notes/stringvideos.html for full list.