Alright, here's something to keep in mind...
(a.) Getting advice to install the nightlies as a beginner is probably not great advice, because you're not dealing with an official release build.
(b.) Nightlies may not be stable, and thus certain game elements may be broken, etc. In short, you might not be dealing with a fully working build.
(c.) Though some versions of the nightlies might in fact be (and quite possibly/likely are) better than the current release build (3.6.12), the best idea is probably to stick with the official release build until you know what to expect when using the nightly builds. In short, don't put yourself into a position where you might as well be a beta tester for the next eventual release of FS unless you're ready to deal with any of the issues a beta tester might encounter.
As you might guess, I'd recommend using the official release build until you know what you're dealing with or might be getting into. Heck, I still use the official release build!