Ok,… with splines in 3d max you have to convert to a mesh and smooth anyhow. Splines have to have 3, 4 but not 5 points and to be visible you have to apply a surface modifier, then sometimes you have to flip your patch normals for the mat you have made to be visible.
All that is actually not that important, these things you can find out later. What I am getting here is that you are starting out with modelling and reading alone will not help you.
The absolutly fastest way to progress is to do the 3dmax tutorials for beginners FIRST! I have been modelling in 3d for 8 years now but I have just started with 3dMax and I started with the first tutorials that came with the package but because I have done a lot of modelling and animation I just got through them a little faster. I don’t love doing tutes but when I need to know about an aspect of Max I do a tutorial becuse it shows how to achieve what I want and often I will go back to that tutorial when I have forgotten something.
The box tutorial you found on the car is excelent and it is clear to see how the author uses edges if you know what to look for.
Do the beginner tutorials first then go and do the car tute and use poly mesh.
It was Bruce Lee who said: “To think is not enough,… you must DO!”.
Wax on,… wax off,… wax on,…wax off,…grasshopper.