Why does Stata drop my variables?

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The video
Why does Stata drop my dummies and other variables? Stata (or any other statistical software) commonly removes your variables from regression models. Stata states that the variable is collinear. What does that mean? How do we "correct" this problem?
GitHub
github.com/GerhardKling/Stata...
The channel
YUNIKARN publishes educational content in applied statistics, mathematics, and data science. In these fields, programming skills have become essential. Hence, we cover various programming languages, including Python, Stata, and C++, to tackle problems and for fun. We upload recorded tutorials or live streams on Mondays.
Hashtags
#stata #dataanalysis #regression