Some cases will have fewer of these connectors, as things like reset switches and hard drive activity lights are becoming far less common.
Lastly, there are the tiny front-panel connectors, including power, reset, HDD activity light, etc. These need to go to the appropriate pins on the motherboard (usually in the bottom-right corner if your motherboard is mounted in the traditional orientation). You’ll definitely need to consult your motherboard manual to see where each should go, as this also can differ based on board make and model (though it has become more standardized in recent years). Some cases will have fewer of these connectors, as things like reset switches and hard drive activity lights are becoming far less common. And some cases will provide these in a single block, rather than tiny pins, which should work in most recent-generation motherboards. Additionally, some motherboards include a block to plug the connectors into, which you can then in turn plug into the motherboard all at once.