Where is my list stored?
In your browser's localStorage, and nowhere else. That is why no account is needed – but it also means the list is not visible from another device or browser, and clearing your browser data clears it. Use "Export JSON" to take a copy with you and "Import JSON" on the other device.
How do tags work?
Just write them in the task text, like "#shopping" or "#work". Tags are picked up automatically and appear as buttons above the list; press one to filter and "All" to go back. A task can carry several tags, and because a tag is simply part of the text, editing it out removes the button too.
How do I reorder items?
Use the up and down arrows on each row, or drag a row to a new position on a desktop browser. The order is saved and is used for printing and copying as well. Completing an item does not move it – it stays where it is – so use "Clear completed" when you want the finished ones gone.
What does printing look like?
The buttons and input fields are hidden, leaving the date and the task list with real checkboxes. If a tag filter is active, only the filtered items print. Choose "Save as PDF" in your browser's print dialog if you want a file rather than paper.