Log in to the UniOfCam or Eduroam wifi – available in the David Attenborough Building, University Library and many other university buildings – and you will get access to most subscription ejournals and databases such as Web of Science. If you hit a paywall, try searching for the article on iDiscover and follow the link from there.
University members can also access eresources off-campus, but you will need to log in with Raven. Look for the log in button labelled institutional or Shibboleth log in.
Remember many journals and reports are freely available online. Even if you reach a paywall you can check if a free version is available using the Open Access Button.