Further to GeorgeC's comments:
This is what is great about the internet. I expound on a philosophy and someone comes along with a different experience and presents their point of view.
You are the beneficiary of two people's divergent experiences. Now, you will be able to test my theory with little cost and that may be adequate for your purpose. However, I stand by my comment "I introduce enough errors into a project I don't need tools adding to the confusion."
On the flip side, GeorgeC has found a factory made item to suit his purposes. I would then challenge you to purchase an excellent protractor, something with precision, and see if you can duplicate the accuracy that GeorgeC purports. Then, if you're rich, go out and buy the factory made item and compare the accuracy of that to the accuracy of the other methods.
Personally, I measure with a proven scale, I mark with a Striking Knife (LeeValley 50CD01.01,) I markup my parts with pencil and tape, I use the best equipment I can afford set as accurately as I can see and I still screw up the project badly enough that it looks like S---! I've not yet attempted something that goes into the house or that resembles furniture.
In all fairness though, I use poor materials, scraps from the local pallet factory (and if they can't use it in a pallet, it's got to be worse than bad) and I still have a bunch of 100 year old studs with holes, burn marks, nails still in them, etc.
So, learn with the scraps, develop your own techniques for doing things, use templates of your own design, acquire a shop that meets your purposes, don't race the Joneses they'll always be ahead in your mind, be prepared to redo a project two or three times before you get it right, and _enjoy yourself_! All the rest of it is garbage!
I come by my handle honestly -- Allthunbs