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Hello, friends! I have a simple code for drawing blue dots:
\documentclass{standalone}
\usepackage{pgfplots}
\pgfplotsset{compat=1.16}
\usetikzlibrary{arrows.meta}

\begin{document}
\begin{tikzpicture}
\pgfmathsetmacro\m{5}
\pgfmathsetmacro\n{4}
\begin{axis}[
xmin=0, xmax=\m, ymin=0, ymax=\n ...