Many people think that top-level domains (TLDs) are better than second-level domains (SLDs) in terms of quality. These are just the terms used for the different sections of the domain name. TLD is what comes after the “.”, and SLD is what comes before it. For instance, in firstsiteguide.com, “.com” is a TLD, and “firstsiteguide” is an SLD. Together, TLD and SLD make a domain name.