Peter N. Roth reviewed "C# Precisely", and "Effective C#" in the latest issue of C++ Users Journal.
You can read the full review here: http://www.cuj.com/documents/s=9897/cuj0510book/
I'll only add one point: Peter rightly complains about numerous combined word errors that were introduced in the typesetting process. Those have largely been fixed in the second and subsequent printings.
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I create content for .NET Core. My work appears in the .NET Core documentation site. I'm primarily responsible for the section that will help you learn C#.
All of these projects are Open Source (using the Creative Commons license for content, and the MIT license for code). If you would like to contribute, visit our GitHub Repository. Or, if you have questions, comments, or ideas for improvement, please create an issue for us.
I'm also the president of Humanitarian Toolbox. We build Open Source software that supports Humanitarian Disaster Relief efforts. We'd appreciate any help you can give to our projects. Look at our GitHub home page to see a list of our current projects. See what interests you, and dive in.
Or, if you have a group of volunteers, talk to us about hosting a codeathon event.