The Spanish preposition a is generally summarized as "to or at," but it has a few more meanings and uses than that.
The Spanish preposition de is generally summarized as “of, from, or about,” but it has quite a few more meanings and uses than that.
The Spanish preposition en is used to indicate location, amount of time or money, proportion, and more.
Although normally prepositions are not used in front of direct objects, in Spanish there is a special preposition called the personal a which precedes direct objects that refer to people, personified nouns, and animals.
The Spanish prepositions por and para tend to be difficult for Spanish students, because they can – but don’t always – both mean “for.” Por is considerably more common, so in theory, you might be able to get away with just memorizing the uses for para and then using por for everything else. In reality, it’s good to learn the rules, so here they are.
In English, we use ‘s (apostrophe s) to indicate that one noun possesses another. The Spanish equivalent is the preposition de, with the order of the nouns reversed.