What techniques are used by stalkers?

Step 1: Research articles on celebrities who have been stalked.
Step 2: Research the role the law plays in stopping stalkers.Specifically, how does the law define stalking? How can stalking be stopped within the law?
Step 3: Answer the following.What techniques are used by stalkers?Are all stalkers potentially dangerous?What constitutes the offense of stalking?What laws exist regarding stalking?Are stalking laws a violation of due process?