If you are looking for a quick answer to your query, the self-directed learning resources below may be a useful starting point.
Literature searching e-learning
Interactive and engaging, these new modules hosted on the e-learning for health platform are highly recommended. They provide clear explanations of the steps required for literature searching on healthcare databases. No password is required to access these modules, although registration is recommended if you would like a certificate to confirm that you have completed a module for CPD purposes. https://www.e-lfh.org.uk/programmes/literature-searching/
Searching healthcare databases and NICE Evidence Search
These guides can help you to search NICE Evidence search and the healthcare databases more efficiently. Guides available here include short, quick guides as well as longer, more comprehensive guides that contain hyperlinks to quickly jump to the section you need.
This page contains training guides on a number of different databases, including the Cochrane databases.
The Online Library Catalogue
For guides on how to search, reserve and renew books and other items on the library catalogue. See the FAQs section on the Base Library website: https://base-library.nhs.uk/