Please help me with some computer hardware terms. (e.g. RAM, Processor, SAS drive, etc.)

I really know nothing when it comes to computer hardware. Could you please help me with these terms? I need to know what they are and how they benefit the user. Thanks! 1. Processor and number of cores. Also, what difference does the Ghz make? 2. Memory/RAM. How will more of it help? 3. RAID Card (mac-only... show more I really know nothing when it comes to computer hardware. Could you please help me with these terms? I need to know what they are and how they benefit the user. Thanks!

1. Processor and number of cores. Also, what difference does the Ghz make?
2. Memory/RAM. How will more of it help?
3. RAID Card (mac-only term)
4. Serial ATA and Serial Attached SCSI (SAS) drives
5. Fibre Channel PCI Express card (Maybe a mac-only term. Not sure)
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