Getting started searching in PubMed is pretty straightforward - you just need to understand what the database does with your search terms.
Briefly, when you enter your search into the box, PubMed will analyze your terms and add related terms to your search. These related terms will include synonyms and the appropriate Medical Subject Headings (MeSH) terms.
To learn more about searching in PubMed, click the image to the right for a brief video tutorial on how to find articles by subject!
Here are a few more tutorial videos on different types of searches: