Check out example codes for "add dots to line matplotlib". It will help you in understanding the concepts better.

Code Example 1

#Python, matplotlib
from matplotlib import pyplot as plt

#Create the regular line graph with plt.plot, then add the marker argument.
plt.plot(df["col1"], marker='o')

#Example of a few markers:
   -                solid line style
   --               dashed line style
   -.               dash-dot line style
   :                dotted line style
   .                point marker
   ,                pixel marker
   o                circle marker

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