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This question already has an answer here:

Where do we use sich freuen auf and sich freuen über

marked as duplicate by c.p., Jan, Robert, jonathan.scholbach, Em1 Mar 18 '17 at 21:37

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  • More context please! Give us examples of sentences where you feel uncertain. – Hubert Schölnast Mar 18 '17 at 10:54
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Basically

(a) sich freuen auf = Vorfreude (happy anticipation)

refers to the future (e. g. vacation; end of the lesson) while

(b) sich freuen über = Freude (pleasure)

refers to the present (e. g. a sudden visit of a loved person).

(a) is always connected with expectation, (b) with surprise or prior uncertainty, doubt, fear (e. g. concerning the result of an examination).

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