Maps gives you an easy way to prioritize places when viewing an area or searching. This will make them appear at the top of search results and always on the map at certain zoom levels.
To prioritize a place, tap on it and scroll its location card to the bottom. One of the buttons there is “Add to Favorites.”
This tells Maps to favor it in you general browsing and searching. It works on places that have an official info card, like businesses and parks, as well as manually typed addresses. Also, iCloud syncs your Maps favorites with all your devices.