A book describing all the key ideas in Scroll with sections for beginner, intermediate, and advanced users.
https://try.scroll.pub is limited and hacked together. A browser version should be shipped in this npm package and it should support adding Parsers so people can use the full power of Scroll + Parsers completely in the client.
In addition to the above, Scroll is written in Parsers and will get all the planned improvements in the Parsers Roadmap as well.