Books are a good starting point when you want to find out about general theories and background information.
Use Library Search to search for books on your topic. Don't be too specific in your choice of keywords. If you were looking for books about tracking shots, for example, you could search for titles about cinematic techniques and then read the appropriate chapter.
As a Falmouth University or University of Exeter student you have access to all the books in the Penryn Campus Library and the Falmouth Campus Library. You can also request to borrow books from the libraries on the Exeter campus.