Make your profile private. By making your profile private you can know and control who is available to complete certain actions involving you. You can do this by going to the "privacy" section in "settings". These are the recommended settings ------->
Never follow or follow back people you don't know. This can be very dangerous and lead to many problems.
One of Twitters advanced features is being location aware which means that anyone can see where you have tweeted from. Always keep this option turned off. It is very dangerous for anyone to know exactly where you are at a certain time.