Am ... That's not a tutorial but just the help file in pdf. It's good to have this as pdf but it's the same you have access to in Cheetah. Certainly important to look into (and be happy it isn't as big as for other 3d packages). But, as manuals are, if you don't know what to do, you're still helpless, so read in parallel something else:
Podperson used to write a book for each Cheetah version aimed at beginners. This time around it's not in book form but online and very generously offered for free. This is exactly what you're looking for and will certainly cover your first steps in Cheetah and in the world of 3d in general.
http://loewald.com/c3dbook-v7/#source=2_Introduction.md.
The real problem you have is something else, though. There is the program to learn, but there is also modeling in itself, texturing, uv-mapping, rendering (at least you don't have to learn anything anymore about colors, composition, etc). This things are comparable, in case of modeling often the same in any 3d package. Cheetah does help you here because it's not cluttered and is imho the easiest 3d app to use (it makes the stuff itself not more difficult than it is).
For this you'll find in this tutorial section here quite a lot of tutorials, some aimed at the beginner like
Simple intro to Materials for new users, some for just one specialty like
pbr materials and others more for people who already have some more experience or are a bit exotic (i. e. you maybe never need to know it). With this you can go already a lot further.
The real good modeling guide is missing though (and it's nowhere to be found for any other app). There are some software agnostic books and even youtube-videos, though (i. e. the methods should work more or less in any program). And as soon as you know your ways in Cheetah you can adapt tutorials for other software (I would avoid such for houdini (node-based modeling isn't possible), rhino (no nurbs here or in most other 3d apps, and blender (that works sometimes a bit different than other apps and the quality of the tutorials is somehow not always on a high level which you can't really judge when you're still a beginner (which you will be for a long time)).
And if you don't understand something, find nothing about it in this forum or just plain don't understand you can ask in the general section of the forum.
Welcome and have fun.