I was chatting with a friend I wanted to say that I was about to do some exercises and I said "voy a hacer algunos ejercicios de conjunciones básicas".
I was wondering that in this case, should I use "sobre conjunciones"?
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Prepositions are tricky but in this case both are ok and you can use either.
Same as in English when sometimes you can use on or about i.e:
It is very entertaining for a book on mathematics / Es entretenido para ser un libro de matemáticas
It is very entertaining for a book about mathematics / Es entretenido para ser un libro sobre matemáticas