Assuming you just closed your SCH C business and not a coporation type business, You'll indicate where asked, that you sold, closed or otherwise disposed of the business.
If the business had any inventory, your closing inventory balance must be zero. If not, then you must show the disposition of that inventory. If you did not sell that inventory, then simply select the option to indicate it was removed for personal use. That will make the ending inventory balance zero.
If your business had any assets listed in the business assets section, then you must show the disposition of those assets. Assuming you did not sell those assets, work through each asset in the Business Assets section to indicate you stopped using that asset in 2021. Then if presented the "Special Handling Required?" screen, select YES on that screen. If you select NO, then you will be forced to enter sales information. Kinda hard to do if you did not actually sell the asset.
If your business claimed any vehicle use at any time while the business was open, you must show the disposition of that vehicle. Even if vehicle use was less than 100% business use. Simply work through the business vehicle section to show it's disposition. Most likely, you'll indicate it was removed from the business for personal use.
Once your end of year inventory balance is zero, all assets have been properly disposed of, and all vehicle use for the business has been terminated, that's generally it. There very well could be more. But for your typical SCH C business those three items are all you need to deal with. Other possibilities could include dealing with employee information if the business had W-2 employees, as well as any outstanding balances with 1099 contractors or sub-contractors of/to the business.
