[This][1] course on Real Algebraic Geometry from Konstanz Universität's professor [Markus Schweighofer][2] is a really good introduction to the topic.


  [1]: https://www.youtube.com/channel/UCcsp7yAQjJQHx3SN3aL_r1A
  [2]: https://www.math.uni-konstanz.de/~schweigh/