Deadman 2421

Google is your friend mate,

https://www.nvidia.com/en-us/geforce/graphics-cards/rtx-2080-super/

Do I need to have 2 1tb ssd Cards in my gaming rig?Or would one be enough as this is my first time building my pc and my mate say I need two.many thanks 

Depends on how many games you want to store on the SSD. Realistically, you'd get better overall value out of a smaller but fast NVMe SSD and a larger SATA SSD (or if your collection is particularly huge like mine, a 7200RPM HDD). For most games, load times are bound by the CPU/GPU/RAM past a certain point, and storage speed increases won't result in significantly faster load times, especially if the game is the only thing running on the drive. SATA SSDs by and large still satisfy that point of diminishing returns and are often much less expensive per GB (though this is changing slowly - WD/Sandisk NVMe drives can be relatively inexpensive).