You want your home to feel welcoming without the stress of a massive bill hitting your bank account all at once. By timing your purchases right, you can focus on the people instead of the price tag.
Think of this as a project with a clear finish line. Spread your costs out so you are buying essentials over a few weeks rather than panic-buying everything in one afternoon.
The 0% window is a deadline, not a gift. If you have not paid off the full $600 by the end of the 18-month period, the remaining balance will begin accruing interest at the standard rate.