Notebooks is a writing app, text and markdown editor, file organizer, task manager, eBook creator and more. You will quickly learn to appreciate this combination, because one task often leads to the other: a few text fragments, randomly created, want to be combined into a chapter of a novel and output as PDF or eBook; a quick note sparks off an idea which results in a set of tasks, which in turn require the collection and organization of research material; these documents should be separated from private diaries, records and files. – Notebooks easily handles these jobs in one place and allows you to focus on your work and remain creative.
So start creating documents with styles, attachments, tables and checklists, or drop any kind of document into Notebooks. File them in as many nested books as you need to structure your projects and details. Add task lists or simple checklists, divide large projects into nested sub projects, which makes them easier to handle, cross-reference into your reference library, and make Notebooks the repository for everything you want to keep close at hand.
All your documents reside as regular files on your Mac. There is no database that locks away your files, so you can always access them from Finder or other applications, too. You don't ever need to worry about export or migration.