\documentclass{article}
\usepackage{tikz}

\begin{document}
\begin{tikzpicture}[scale=0.8] % <- Scale picture
	% Coordinate system grid
	\draw[step=1.0,gray,thin] (-5,-5) grid (5,5);
	% Coordinate system axis
	\draw[->] (-5.5,0) -- (5.5,0) node[right] {x};
	\draw[->] (0,-5.5) -- (0,5.5) node[right] {y};

	% Two points
	\draw [fill] (1,2) circle [radius=0.1];
	\draw [fill] (4,3) circle [radius=0.1];

	% A line
	\draw (1,2) -- (4,3);
	% A colored line
	\draw [red] (0,0) -- (-2,-2);
	% A dashed line (other options: thick, dotted etc.)
	\draw [dashed] (0,0) -- (-2,2);

	% A path
	\draw (0,0) -- (2,-1) -- (2,-2) -- (0,0);

	% A text label
	\node at (4,3.3) {Text};
\end{tikzpicture}
\end{document}