They include Title, Author, Subject and All three plus Contents Notes. Keyword searching finds the term anywhere in the index listing - in the middle of a title, at the end of a subject heading, etc. You must type in the whole word or phrase to use for searching. Only what is entered will be searched and there is no truncation in the Keyword Indexes. The term flower returns different hits than the term flowers.
Stars is a possible search.
AND OR NOT can be used. Truncation can be used in Advanced searches. Another feature of the Advanced searches is the ability to use qualifiers. Click on your choice and follow instructions. Qualifiers remain until turned off or you go back to the Options page.