Known item searching
Ex: I have a full citation and know this thing exists but don’t know where I might find the full text
Partial citation searching
I have part of a citation and need to find the rest
Grey literature searching
Grey literature is material published outside of traditional academic pipelines such as government research, white papers, or reports
General database searching
Entry level searching
A catch-all search
Google Scholar is usually too broad for these kinds of searches and lacks the same kind of curation and limiters that library databases have