Inc. To main page. Don't sign anything you're unsure about. Book publishing contracts are fraught with pitfalls for writers. As you would expect, contracts are written from the publisher's perspective, and for the purpose of benefiting the publisher.
Contracts are often the sum of a publisher's past mistakes and problems.
Most of the time, the process of writing and publishing a book go smoothly. Publishers recognize this, too. As a result, they may be willing to be flexible about their contracts. But you have to ask for changes. Insist , sometimes.