All contingencies are negotiable. There are no standard contingencies. There are contingencies commonly included in Offers. Whether or not your ability to close the sale will be subject to any contingency is choice you have a say in.
Expect your real estate professional, attorney or licensee, to discuss each contingency and what it means to you with you. Accept nothing as standard. Before you commit to relinquishing control to any buyer, you have the opportunity to think about the risk the contingency shifts to your side. Just because it’s in the Offer does not mean it’s important to the buyer. Sometimes contingencies get into Offers for no better reason than because they’re there. Expect more.