I think the following statement is wrong :

"R-squared is the measurement of how much of the independent variable is explained by changes in our dependent variables. "

The correct should be something like :

I think the following statement is wrong :

"R-squared is the measurement of how much of the dependent variable is explained by changes in our independent variables.

"R-squared (R2) is a statistical measure that represents the proportion of the variance for a dependent variable that's explained by an independent variable or variables in a regression model."

ref: https://www.investopedia.com/terms/r/r-squared.asp