Companies, with good and bad reputations, are in the business of making money and acquiring and keeping customers. They are naturally biased in favor of their own products, so watch out for inflated claims for performance and quality. Companies will not showcase their competitors' products. If you are, for example, comparing products, get impartial reviews, not company information. URL addresses are hierarchical.
Web sites serve different purposes.
There are reliable and unreliable Web sites in most categories of Web sites. A personal Web site, which expresses the interests and biases of its author, is a legitimate use of a Web site, as long as the Web site owner is up front about his or her identity. Like any other source, the authority of the author helps determine the value of the information. Be wary of sites which publish information without letting you know if the information is a personal view or, if not, what the original source is. Web sites can masquerade as one type but may have a hidden agenda.