When choosing a license key for Windows or Office, it is important to approach the process carefully to avoid buying fakes or invalid keys. You should start by choosing a reliable source - it is best to buy from trusted platforms with good reviews and reputation, such as pexlkeys . Make sure that the key is intended for your version of the program, be it Windows 10, Windows 11 or Office 2019, as well as for the desired type of use - home or enterprise. Be sure to pay attention to the type of license: OEM or Retail, as they differ in terms of use. OEM licenses are usually tied to one device, while Retail can be reused when replacing a computer. Another important aspect is the availability of a guarantee for the key. For example, on some platforms you can return your money in case of activation issues. Before making a purchase, check that full support is provided. Also, keep an eye out for promotions and discounts - you can save a lot if you find a key at a special price.