The International Component for Unicode (ICU) library can save you from being hopelessly mired in numerous character encodings as your C/C++ application matures into internationalization and localization.
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Learn about UTF-8 encoding of UNICODE characters.
Lots of hot topics are covered in the Discussion Forums on CodeGuru.
Adding multilanguage support to your application
Multilingual Applications - Switching Languages
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Explore how to pass multiple parameters in a query string of a Web API URL.
Finish this two-part article and create a color picker app for .NET. Examples are both in C# and VB.NET.
Many people are still using older programming languages. Think about the pros and cons.