Understanding the "basics" of your product will help identify keywords & terms to research:
There may be books (physical books &/or ebooks) on aspects of your topic:
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Encyclopedia, dictionary and biographical entries from hundreds of sources for most subject areas. It includes images, diagrams, maps and photos, and audio pronunciation files and sound clips. Coverage 2000 – present.
This link opens in a new windowEncyclopedia and dictionary entries for most subject areas. Dates covered: latest edition of each title.
This link opens in a new windowEbooks on most subject areas. Read online or set up an account to download or print up to 30% of pages. Please close or "release" a book when you are finished. Coverage: varies.