Sometimes it is the only way to sell a business if the buyer can't get conventional financing. You will receive interest on the amount that the buyer owes you. You can use the assets that you sold as collateral for your loan to the buyer. Try to get as large a down payment as possible, then take a note for the balance of the purchase price. Secure the note with a mortgage on the real property sold and a security interest in the personal property sold.
Seller financing can be quite flexible.
You can adjust the terms and conditions of the financing to match your buyer's financial situation. You must take the time and energy to carefully evaluate the buyer's financial condition to determine whether the buyer is a good credit risk. You won't be paid in cash, so you won't have the funds available to invest elsewhere. You will have to monitor the buyer periodically until you are paid in full to evaluate his or her financial condition. You run the risk that the buyer won't pay and that you will get the business back.