There are structures all over PlayerUnknown’s Battlegrounds, but lots of them tend to yield garbage equipment, if they contain any at all. Certain locations — warehouses, industrial structures, military bases, stores — tend to have better gear, especially near towns. Better still, unique locations, such as blasted government buildings, tend to have good gear as well.
When you find particularly great stuff, check the map and note the nearby names and landmarks. The locations that tend to have good stuff often tend to see it spawn a little more often than random houses spread throughout the map. You’ll want to concentrate on starting in locations where you’re likely to get good equipment fast, and learning those locations is invaluable.
Do the same thing with cars. Note where you find freshly spawned cars every time you get in one. You’ll be glad for the knowledge in later games when you’re desperate to cover a lot of ground and don’t want to run across the whole island.