In most cases, you can use .com for your personal website, but there are some legal implications. First of all, it's unwise to create your personal site under any TLD (Top Level Domain) extension that is associated with any type of business. That includes .com, .net, .org, and other commonly-used extensions. This applies even if you don't plan on using your site to sell products or services. With that said, companies like Google have been known to park domains by either buying them up or registering them directly through ICANN (Internet Corporation for Assigned Names and Numbers). Doing so can prevent you from using such domain names if they happen to match your desired ones too closely.