A problem on Algebraic Geometric Codes

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I am reading from https://www.math.nmsu.edu/~pmorandi/math601f01/LectureNotes.pdf. In page 50, if $k=0$ then why $\deg(G)<0$ and if $k=n$ why $\deg(G)>n-2$? Here $k$ is the dimension of the corresponding Goppa Code?