At the top, usually in the middle or on the left.
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The title of a graph should be an indication of the information that the graph is meant to convey. It may not be a direct description of the data but it should certainly be relevant to the data being used. For example, a graph showing number of residents against years might have a title of "Growth in the town". The title refers not to the data but to the information the graph is showing.
to know what is the thing that you are expiramenting
Create a title and label the axis.
You find the main idea of the graph then make the title based on that.
it describes the data shown simply in a short phrase