Here are some helpful links and articles that provide information on behavior problems

• Jackson Galaxy
  Jackson Galaxy is a cat behaviorist and wellness expert, youtuber, and the host/executive producer of Animal Planet's show "My Cat from Hell". Check out his website for help videos, blogs, and articles about cat behavior. 
• Do's and Don'ts of Introducing Cats 
  Here is a helpful page along with videos of how to properly introduce cats to one another