new to V1 and CNC

im new to cnc and was looking to buy the low rider bundle to get started and I had some questions, on the site there are red and black 3D printed parts . What are the differences between these, the black ones are cheaper it looks like but I was looking for all black anyways, but was wondering if there any limitations to anyone or the other. I would be using this cnc for wood and thin aluminum maybe some acrylic. Want to find out exactly what parts I should buy besides piping. All recommendations welcome from which parts and which softwares are better for beginners.