How do I change the font size and type for the axis

I cannot figure out how to change the font type and size on an axis in any plot.  I cannot see the values on an axis without zooming in.  Copying a plot to paste into another document leaves me with a graph that is nearly unuseable.  U can change the axis label fonts easily enough but the actual values on the axis is impossible.  I certainly must be overlooking where the command(s) are to do this.