As a potential author, I want to understand the initial steps for submitting a book idea to Springer Nature. Specifically, identify the primary method for submitting a book idea and list the main categories of resources available in the 'Author resources and services hub' to support authors through the publishing process.
Navigate to the 'Author resources and services hub' page on Springer Nature. Identify the primary link or section for submitting a book idea. Identify and list the main categories of author services and resources provided on this hub page.
State that the primary method for submitting a book idea is via the 'Submit your book idea' link. List the main categories of author services and resources available on the hub page, such as 'Understanding your options', 'Writing your manuscript', and 'Promoting your book'.