Forward secrecy. Control and limit the amount of personal information you give away on the internet. Use more than one web browser to compartmentalize different activities from one another, use a separate computer just for legit business or private use, do not mix business with pleasure. All of this will help prevent you from being doxxed, and preventing third parties from being able to track everything you do online. Most importantly, ditch the smartphones already and stick to laptops. Always remember, if there is anything you do not want others to know about it is best to keep your mouth shut, never post anything about yourself on the internet you would not want others knowing. Forward secrecy is the best kind of secrecy.