have just started with XamU classes, namely, XAM101 and XAM110 (the basics). Both are fine, but looks bit obsolete, eg. refering to PCL (now deprecated and replaced with .NET Standard) or often talk about Windows Phone (officialy dead for more than a year). These two classes are available for free, just wondering if it is worth paying for the XamU? Are there interesting up-to-date courses, working with VS2017 and .NET Standard?