There are four ways of saying "some" or "of the" in French. Each expression is dependent on the gender and number of the noun that follows it.
du + masc/sing noun e.g. je bois du vin
de la + fem/sing noun il mange de la salade
de l’ + sing/vowel/h elle prend de l’eau
des + plural noun nous prenons des frites
Remember that these expressions are often used with the verb "faire" where we would say "to go swimming, skating, skiing", etc..
e.g. Je fais du ski
Il fait de la natation
Nous faisons de l’équitation
Tu fais des promenades
Very similar to "some" above, there are four ways of saying "to the" or "at the" in French, each dependent on the gender and number of the noun following the expression.
au + masc/sing noun e.g. Je vais au collège
à la + fem/sing noun Elle va à la poste
à l’ + sing/vowel/h Ils vont à l’église
aux + plural noun Vous allez aux magasins