User seeks advice on managing diverse data types in Sanity CMS

Hello. I'm just getting started with Sanity, and am wondering if someone would be able to help me understand the "content modelling" concept?

More detail:I am starting to redesign our website, and want to change the CMS, so it's a great time to look at this.
I like the theory as set out in
https://www.sanity.io/content-modeling that there is one place for all the data in our company, but we have a lot of data "scopes" - for instance web pages, products, internal assembly instructions, product CAD files, standard work et cetera. Some of this will be public (on our website) but the rest will be internal-use only.The thing that confuses me most is how do we host all of this data on Sanity without getting overwhelmed? If I want to edit the website, I don't want to see all the other document types, and vice-versa. I worry that the information I am looking for will be swamped by the other information.
If you have any experience with this, I'd be very glad if you could help me!

👋 This is totally doable in the Studio. You can use both workspaces and the Structure Tool to organize your content into easily navigable spaces. That way you don’t drown in all of your different types.

Thanks! That looks like just the thing I need.

One more question - does each workspace need to be a separate dataset (of which only two are available), or can I reference the same dataset in multiple workspaces?

They can all use the same dataset!