I’m with a college project, where I have to put a piece of a geolocation, but I need to use the API, where can I get the OSM API?
Quite often, “geolocation” is used as a shorthand for “IP address location” (that’s what the OSM wiki page covers).
However, I suspect that you might be wanting to do something like find the latitude and longitude of a named place? If so, have a look in the OSM wiki for “nominatim” (which is the software that OSM uses to do that).
If you can provide a bit more detail on what you are trying to do, I’m sure people will be able to help more.