You should discuss with your agent, but some contingencies might include:
3. Credit toward closing and prepaids
4. Inspection of entire premises, including but not limited to radon, radium, well, well water, well, septic....
5. Closing date and many more.
6. Occupancy date
7. And many more.
Some of the above are required in our state by most lenders and others are not. In most cases, the more contingencies you put in your offer, the less likely the seller is going to accept. Sellers like clean unencumbered offers. That said, you need to protect your investment before you buy so buyer beware.