To buy a home, obtaining a mortgage pre-approval is essential. This process helps determine your borrowing capacity and interest rates based on your financial information. Pre-approvals are typically valid for 30 to 90 days and can be obtained from multiple lenders for comparison. Key steps include checking your credit score, gathering financial documents, and understanding your budget. While pre-approval indicates potential eligibility, it does not guarantee loan approval, as financial circumstances may change. It's advisable to assess your finances before seeking pre-approval.