PubMed Tutorials and Classes PubMed Essentials 2020 10 very short video-modules (2-3 minutes each). Learn More How PubMed Works A series of four 90-minute classes presented via WebEx. Learn More Medical Subject Headings (MeSH) in MEDLINE/PubMed Explains the purpose and structure of MeSH and how to use MeSH to search for literature. Learn More