Question: When explaining regression, the textbook states that a challenge of the process is to find the best-fitting line.

Question:

When explaining regression, the textbook states that a challenge of the process is to find the best-fitting line. Does this mean that there can be multiple lines that can be given within a regression example? And then to find the best line, this is where predicted Y and residual that is unaccounted for is used?

Are coefficients the key to finding what regression line is?