Watch what you post on the Internet.
Digital footprints never go away. Most colleges and employers look on the Internet to see what you are doing. If you post pictures of you partying and doing things that are illegal you can get in trouble with your employers. They could turn you into the police or not hire you or fire you. Colleges may not even accept you in if you have bad digital footprints.
Never goes away.
Once you put something on the Internet it is there forever. You never know who had downloaded it or saw it or emailed it to someone. It's there forever. Even if you go to lengths to try to erase it or get rid of it.