With START you can search in many databases at once. You will find e-books, articles from (scientific) journals, literature references and statistical data.
On the advanced search screen, on the right, you can see which databases are being searched. You can also turn them on and off separately.
If you get a lot of search results you can use the filter options on the left. For example, you can limit your results to only books from the last 5 years, by checking 'eBook' and 'Last 5 years'.
Sometimes you will find references to books or articles that the library doesn't have access to. If you check 'full text' (under 'content') you will only get results that you can actually read.
If you would you still like to read a book or article that isn't available full text, you can request it via Interlibrary loan (ILL).