Depending on your search topic you are likely to start your search using one of the public health “heavyweights” such as PubMed or Medline database. You may ask, and it is a good question, what is the difference between the two ? In short, PubMed contains Medline references, so is often a good starting point, and the interface is similar to another big public health database “Embase”, so you can easily switch databases using the same keyword searches. Other databases are more general such as Scopus and Web of Science, which focus on the wider Social Sciences, and others more specialist such as PsycInfo, and Africa-Wide Information.
“Why can’t I just search Google” ? , you may ask. Well you can, via Google Scholar (https://scholar.google.co.uk/), which can complement database searching, and useful for comparing search results.
Here are some useful links :