If you need to visit multiple shops to do your shopping, you might create an item called Shopping, and inside it list the shops you must visit, then within them you list the items you must buy.

You can keep your to do list simple by listing the name of a task, then within it you can list the steps required.

You may also split your To Do list into daily, weekly, monthly and yearly sub lists.

You can maintain a workout split, using the days of the week as list items, and within each day you specify the exercises.

Or maybe you'd like to list Chest workout, back workout, legs workout and abs workout, each with their own exercises.

Quickly jot down notes as items in a list, and if more details are required, open each item and add more details.

If a To Do list is for small items, you might keep a project list for larger projects that you want to work on one day.

Each item can have a sub list of instructions, it's own shopping list, notes and links to further study material.