I really love the YouTube channel Coding Train [0] - he also made some videos about L-Systems which he also explains in his free book The Nature of Code [1].

My username for HN was inspired by the creator of L-Systems, hehe.

[0] https://www.youtube.com/watch?v=E1B4UoSQMFw

[1] https://natureofcode.com/book/chapter-8-fractals/