Every year, Microsoft adds a huge collection of new items to its library of free downloadable e-books. And today was the day for 2017. The library now runs to more than 100 books, and they're available permanently for free download in PDF format for you to read on your PC or tablet.
Being from Microsoft, the collection is obviously all about Microsoft technologies. Some of the titles are aimed at technical readers or those in large companies, who look after servers. But there are also some great new titles which cover Windows 10 and Microsoft Office, which you might well find useful.
The full list, with download links for each title, is at https://blogs.msdn.microsoft.com/mssmallbiz/2017/07/11/largest-free-micr...
As mentioned, all the books are free, and there's no limit on how many you can download, how long you can keep them, or when the download offer expires.