With respect, the tutorial just scratches the surface and illustrates the fact that using Contentful in Angular pretty much requires developers to write their own service to encapsulate two or three of the SDKs.
It would truly helpful if there was an npm package or prebuilt Angular service that exposed the full power of the SDK. If one already exists, I’d love to know about it, but all the examples I’ve found (like the basic one from UseAllFive) just allow entry retrieval. Any non-trivial app requires CRUD support to some level.
I truly enjoy Contentful and have used it in a few projects so far. If I find the time, I’ll make the code I’m writing into something general I’ll put it on GitHub and let you know.