As you start to find interesting articles, you want to make sure you have a place where you can store these citations since you went through the hard work of searching for them.
RefWorks is a popular tool to manage your citations. And, if you are a UCSF faculty, staff, or student, you can set up an account for free because the UCSF Library has a site license for RefWorks. There is a great tutorial to help you get started.
EndNote is the most well-known bibliographic management software. If you are affiliated with UCSF, you get a discount if you purchase it from the UCSF Technology Store. There are helpful tutorials that walk you through how to use it
These types of software not only allow you to store your citations in one place, but when you are writing a paper, you can access your citations and insert the references as you write. Once you start using bibliographic management software, you won't believe that you were able to live without it all these years!