Choosing the Mortgage That's Right for You This guide is written for people ready for the next step in buying a home. How big of a loan can you get? How will the type of mortgage you get determine how much house you can afford? Which mortgage is best for your budget? First, learn what a mortgage is and how to calculate your buying power. Second, understand the different types of mortgages available. And third, discover where to shop for a mortgage and how to compare mortgage terms.