Workflowy is a blank canvas. It doesn't have separate apps for tasks, notes, and projects. It has one structure that can become any of those things depending on how you use it.

Most people start with one use case and find it spreading from there.

Personal productivity

Daily todos, journaling, goal setting, habit tracking. Because everything is in one place, your tasks and your notes can live alongside each other rather than in separate tools that never quite talk to each other.

Work and projects

Project planning with nested tasks and subtasks, meeting notes, action items, team wikis. Workflowy works well for teams because you can share any branch of your document with specific people, at whatever permission level you choose.

Knowledge and research

Capturing ideas, quotes, and reading notes. Writing outlines and drafts. Building up a reference base that you can search and link across. Because there's no friction in adding something, it's easy to get into the habit of writing things down.

All of the above

Some people keep their entire professional and personal life in a single Workflowy document, using tags, dates, and saved searches to surface what's relevant at any given moment. It sounds extreme until you try it.

Tip: If you're not sure where to start, just start writing. The structure will emerge.