You can reject, accept, or counter any offer that is presented to you. Most offers include contingencies, which protect the buyer in case something goes wrong.
The two most common contingencies deal with financing, which makes the sale dependent on the buyer’s ability to obtain a loan commitment from a lender within a stated time period, and an inspection, which allows the buyer to have a professional inspect the property to their satisfaction.
There really is no reason not to consider these contingencies because they are quite reasonable and standard.
However, think twice about a contingency that is predicated on you making expensive home repairs, such as a kitchen renovation. Now, if the roof is caving in, that is an entirely different story. You may need to spend money to replace it or lower the asking price of the home.