I kept wanting to add more and more stuff to this but realised it was meant to be a short crash course intro to some sources, so here you go. A rundown of the major sources of information we have on Johannes Liechtenauer.
Consider this like a really basic road-map to sources if you decide to crack one open. It’ll show you roughly where you’re at and where you might want to go next.
Needless to say there is much, much more to it than this. But it could get you started.
Aliquid de Magis 