A:AnswerWhich one you should add is going to depend on what capacity drive you want and your budget. The computer has only one drive bay, so you'd actually need to replace the existing drive and then transfer your files back over.
A:AnswerMost monitors with VGA or HDMI connections will run with this desktop. You will need to buy a camera and speakers separately.
Here is a great HP monitor that comes with a cable:
https://www.bestbuy.com/site/hp-24yh-23-8-ips-led-fhd-monitor-black/6261464.p?skuId=6261464
Here is a nice webcam:
https://www.bestbuy.com/site/logitech-c922-pro-stream-webcam/5579380.p?skuId=5579380
Here are some inexpensive powered speakers:
https://www.bestbuy.com/site/hp-24yh-23-8-ips-led-fhd-monitor-black/6261464.p?skuId=6261464
A:AnswerThe system calls for DDR4-2666 SDRAM . This Corsair Vengeance is DDR4 2400 (PC4 19200).
DDR4-2400 might likely work OK but I would stick with the DDR4-2666 its designed to use.
This should work.
https://www.bestbuy.com/site/corsair-vengeance-lpx-32gb-2pk-x-16gb-2-6-ghz-ddr4-dram-desktop-memory-kit-black/4895510.p?skuId=4895510
A:AnswerYou could, but I'm not why you'd want to spend the money to buy it, and then buy the replacement parts (which may, depending on the case and the motherboard, also require a new power supply)