And then, find out how to contact them in the event you wish to make an offer. One of them would be suitable financing. Another common contingency would be the sale of your present home. You'll probably have a home inspection contingency, meaning that if the home is inspected by a licensed inspector and he finds serious problems, again, you wouldn't be obligated to fulfill your part of the contract. That means, if there is a major repair needed on the house, and the seller has the right to cure, he can fix it and hold you to the contract.
Sellers benefit from having the right to cure.
Buyers benefit from the sellers not having the right to cure. You may have serious doubts about the whole purchase at that point, but you may be stuck. The benefit of having contingencies is that it protects you from nasty surprises during your purchase, and you can walk away without problems. The problem with contingencies is that the seller may decide not to accept your offer if these terms aren't acceptable to them. Take care in writing contingencies.