>>1558792>What's the difference between memory and storage? If a game needs 2GB of memory and 2GB HDD space what exactly does that mean?Memory is RAM, and storage/space is, well, HDD (or SSD) space. RAM is used for whatever is running right now (the OS itself and whatever programs you have open). If the game requires X gigs of RAM, it generally means that if your PC has at least X gigs of RAM the game will work. But if your PC can run Windows 10 you probably have at least 8 gigs, so for the games that require 2 GBs it shouldn't be a problem.
HDD space is what is being used for programs, data, documents, and shit, basically your C: (and other) drives. If your drive is 500 gigs, 250 gigs are already taken by whatever stuff, then if you install the game, 252 gigs will be used.
>Can I just use an external drive for both?For RAM/memory you technically can, you can set your page file to be on an external drive, but it's an extremely stupid idea. But you can install a game to an external drive, and it will be perfectly fine unless it's some shit from the 00s that uses USB 1.1 or some other slow interface or if the drive itself is slow.
>I have Intel Graphics HD 520, are those even remotely comparable/compatible?It does support DX10 and on the integrated GPUs VRAM is just taken from RAM (i.e. if you have 8 GBs or ram it will be 8GBs - 512 MBs = 7.5 GBs), so it should be fine, but the problem is that this iGPU is shit. Unless the games you want to play were released before ~2010 or are some kind of not too demanding 2D games made using renpy or RPGM, you'll have a hard time playing them.