Thanks man thats really helped, but im an idiot, i dont get why youd need an ssd and hard drive can you tell me the differnce
SSDs are hard drives with no moving parts which will cut down on load times significantly, it works pretty similar to the way that flash memory works. But the reason I always include a mechanical HD option is because the high cost per GB and the SSD's limited lifespan - you always want to try to have your OS separate from your data in case of a need to reformat. The SSD comes in handy because when you install Windows it will complete a full install in less than 10 min, compared to 3 - 4 hours on a regular mechanical HD.
But the reason I include those is the high cost / low capacity per GB of an SSD - with a Windows install taking up ~16GB of data you won't have much room to store your large files (games, photos, movies, etc).