The National Institute for Health and Care Research (NIHR) has an excellent online glossary, and the NHS Confederation has a helpful online acronym buster. Both of these may be useful for you as you come across terms which are less familiar.
To view the glossary please visit: https://www.nihr.ac.uk/glossary/
To view the acronym buster please visit: https://www.nhsconfed.org/publications/acronym-buster