The Cochrane Library is a collection of databases providing evidence to support healthcare decision making. The main product, The Cochrane Database of Systematic Review, provides high quality systematic reviews related to health care, specifically medical interventions.
Get started by watching the 2 1/2 minute video below. It explains how to navigate the Cochrane Library database homepage and do a basic search.
(If you find the video to be blurry, make sure to adjust the video settings [Settings > Quality] so that the quality is at 1080.)