Basics
Youtube video series by Made by Layers (Thomas Sanladerer)
https://www.youtube.com/watch?v=nb-Bzf4nQdE&list=PLDJMid0lOOYnkcFhz6rfQ6Uj8x7meNJJx&index=1
Notes
subtractive = cutting away what you don’t want, e.g. laser cutting, wood cutting, CNC milling additive = adding layers and material to create something, e.g. 3D printing
Filament- and resin-based 3D printing. Filament is much easier and used for most applications, resin is used for some special applications.
Software
Prusa Slicer https://www.prusa3d.com/p/prusaslicer/