The library has help pages for using e-books. The easiest way to read an e-book is to access and read it online without downloading it. If you are going to be using the e-book when you have no internet access, you may wish to download the e-book. Each e-book platform can look a bit different, but most have similar features.
Oxford University Press's Very Short Introductions offer introductions to a diverse range of subject areas. All titles provide introductions to a range of subjects, combining facts, analysis, new ideas to make the topics readable.