The best way to fill out PDF forms is to first make sure that you have a PDF viewer installed on your computer. Once you have the viewer installed, open the PDF form in the viewer and use the provided tools to fill in the fields of the form. Make sure to double check your entries for accuracy, as some forms may require specific formats or types of information. Some PDF viewers also allow you to save a copy of the form with your entries so that you can easily access the completed form in the future.