Will getting pre-approved before buying a home hurt my chance of getting approved for a loan when I need one?

Question by SupMid: Will getting pre-approved before buying a home hurt my chance of getting approved for a loan when I need one?
I heard that every time someone runs a credit check on you, it affects your credit rating (in a bad way). Since different banks offer different mortgage rates, and that some banks are tougher to get a loan than others (due to meeting stricter company criterias), how can the potential borrower shop around for the lowest rate that he or she can definitely qualify

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