# Draw grid with points

How would I draw a grid with dots on specified intersections? The image below shows the basic idea:

If I wanted to label the grid lines with index numbers or letters, how would I do that?

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Use Graphics[],Line[],Point[] ... –  belisarius Feb 27 at 21:22

GridLines and Ticks should prove useful.
Graphics[{PointSize[Large], Point[{10, 20}]},