Before you can start any research on your topic, you must have a background knowledge of it. Books and websites can provide you with that knowledge.
This is important because:
Background sources give you the language that people are using to discuss your topic. You will use this language when you start to search databases for scholarly articles and resources on the topic.
This "pre-research" gives you a sense if your topic is focused enough. If your initial searches bring back so many results you can't even figure out what the language is, then you should consider narrowing your topic.
Websites & Background Information
General reference sources of possible interest include:
Credo Reference provides full-text access to dictionaries, thesauri, encyclopedias, quotations and atlases, plus a wide range of subject-specific titles, along with images, sound files, animations, videos, etc. Includes concept mapping, dynamic tables, interactive maps, time lines, and pronunciation audio.
A fully searchable collection of articles by scientists and historians in the fields of biochemistry and physiology, cell biology, developmental biology, ecology, evolution, genetics, immunology, molecular biology, neuroscience, microbiology and virology, plant science, structural biology, science and society.