AND finds records with all of your terms/keywords and narrows your search.
OR finds records with any of the terms and broadens your search.
Truncation finds records with a term's various endings. For example, nurs* = nurse, nurses, nursing, nursed, etc.
Quotation marks search for a phrase instead of individual words. For example, "social media".
Sometimes you will need to find a specific type of research paper, for example qualitative or quantitative research, or review articles. These tips will help you limit your results.
Quantitative (which is about the measurement of a construct and is often numerical, precise, measurable)
Qualitative (which is research for working at eliciting a narrative response and is experiential, not as easily measurable numerically)
Review (systematic, scoping, narrative, etc.)