Please be aware of the distinction between public libraries (as is the general semantic implication when speaking of ”libraries”) serving the whole of the public; national libraries serving the whole of the public, creating systems for the retrieval of information and preserving the cultural memory of the world together with museums and archives; school libraries serving childrens’ and youths’ education; research libraries serving students, scientists, researchers and professionals in, for example, law, medicine, health sciences, industrial research on conducting research, referencing and preserving research data; hospital libraries serving the physically and mentally ill and disabled; and special libraries serving domain-based interests of for example artists, industry professionals and cultural institutions.
Also be aware of the fact that Library and Information Science as a scientific multidisciplinary field researches topics such as information theory, machine learning, cultural heritage, sociology, linguistics, comparative literature, knowledge organization, information retrieval, computer science, pedagogy, critical theory, didactics.
I also suggest a systematic literature study on the term ”information literacy”.