As a final note, if you are not already familiar with the Microsoft Docs website, you really should acquaint yourself with it. It is maintained for the Microsoft developer community and includes everything from detailed APIs for their various languages, tutorial walkthroughs, and code examples, through to downloads of their software.
It can be found at https://docs.microsoft.com and should be the first place you look when questions arise over the members of the various classes in .NET. Should you not find your required information in their APIs, then you can ask questions in their forums and quickly receive answers from both the community and from Microsoft employees.
Another great developer resource is the Stack Overflow question and answer site for development professionals, where I still answer questions when I can find the time. It can be found online at http://stackoverflow.com/ and with answers often provided by the community within seconds, it really is hard to beat and is one of the best development forums around.
For further tutorials, check out the WPF Tutorial.net website at https://www.wpftutorial.net/, where you can find a wealth of tutorials, from basic to complex. And for interesting and novel downloadable custom controls and additional tutorials, try visiting the WPF section of the Code Project website at https://www.codeproject.com/kb/wpf/.
All that remains now is for me to wish you well with your future application development and your blossoming development careers.