Tutorialspoint.com is an online programming blog that contains articles on almost all of the modern programming languages. It has a section dedicated for C# which contains beginners to advanced level content. Content is divided into section in order of complexity with the basic ones at the beginning and the advanced ones at the end.
Learncs.org is a blog that is dedicated full to C# programming language. The website contains an interactive interface were you can run and test your code on the go. This saves you from downloading a compiler and then writing the code and executing it on your own machine. Overall, this is by far the best blog, if you are looking for learningn C# in an interactive manner.