A:Answer You can put more ram inside of it, it has 4 slots but usually 16 gb is good for gaming but if you want to spend $60+ on 2x8 gb you can just as long as its 3200 megahertz ram
And for space you cant buy it more storage off the bat but you buy a hard drive for like $70 for 4tb but you get low read and write cause its a hard drive (aka moving parts) while ssd is yes more $$$ but it doesn't having any moving parts (aka goes zoom), i got my hdd on bestbuy too, and if you do choose to buy this pc and buy hdd the drive bays are easy to get to they are right on the front all you gotta do is take off the glass side panel with the press of the back button, then at the top front of the pc there is 2 hdd slot if i remember right,
I hope this answers your question and sorry for all of the words