The source provides a comprehensive guide on building business credit using an Employer Identification Number (EIN), emphasizing the importance of separating business and personal finances. It outlines a nine-step process, beginning with obtaining an EIN and legally setting up the business, followed by opening a business bank account and registering with major business credit bureaus like Dun & Bradstreet. Key actions for establishing a credit profile include securing trade lines with vendors that report payment activity and responsibly using a business credit card, while also stressing that timely payments and regularly monitoring credit reports are crucial for maintaining a strong score and accessing future financing.