How to find the foci , directrix and axis of any conic from its general equation?

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I was studying about the properties (foci , directrix and axis) of the conics. There all the properties were given for only the conic with axis along the co-ordinate axes . Then a question suddenly hit my mind - How can we find the properties of a conic given in general form (ax²+2hxy+by²+2gx+2fy+c=0) ? Please anybody help me.