The main way to find e-resources is to use iDiscover. There are many library guides that contain tips and advice on using iDiscover, CamGuides and Wolfson College Academic Skills among them. There is also a step-by-step explanation on using iDiscover in the quick guides to iDiscover.
The ebooks@cambridge LibGuide will provide you with full information on finding, accessing, using and citing ebooks.
Finally, you can search a list of A-Z Databases: it is a list of electronic resources that Cambridge University subscribes to, including resources opened up for COVID-19.
With thanks to:
#1 Deepa Iyer (MPhil International Development)
#2 and 5 Anya Melkina (MPhil Japanese Studies)
#3 and 6 Tooshan Srivastava (MPhil Education)
#4 Nicole Tamer (MPhil Linguistics)