This is an example of why the traditional approach to music theory can be cryptic for a beginner. After the Western music moved to well and equally tempered sca

This is an example of why the traditional approach to music theory can be cryptic for a beginner. After the Western music moved to well and equally tempered scales (starting from the early 1700's), the context in which there is a difference between C# and Db has disappeared. But we still use terminology and notation from 500-800 years ago.