Task, project, and area describe different levels of work. The labels are useful only when they change what you can decide next; adding all three to every item creates maintenance without clarity.
A task is one visible action
A task should be startable in one context and have an observable finish. “Send the revised brief to Lee” is a task. “Website” is not: it names a subject but gives no action or completion evidence. If one action exposes more work, record the newly discovered action separately.
A project is a finite outcome
Use a project when the desired result requires more than one action and can eventually be completed. “Publish the September portfolio update” may include selecting work, editing text, checking links, and publishing. The project title names the finished outcome; its task list carries the current steps.
Things explicitly treats an item that takes more than one step as a Project. Wallo uses goals as the outcome-level container for to-dos and windows, but it does not require another project taxonomy.
An area continues without a finish line
An area is a responsibility you intend to maintain, such as household administration or a professional role. It groups projects and tasks but is not completed when one result ships. Things uses Areas for ongoing ambitions. Wallo has no Area level, so do not create fake permanent goals just to reproduce another app’s hierarchy.
Use the smallest structure that keeps current actions understandable. A short personal checklist may need only tasks; a multi-step result earns a project; ongoing responsibility earns an area only in a system that supports it.