How to resell or recycle old computers/parts?


I’ve built up a collection of old computers and parts over the years. I have an old PC and a few laptops in various states of working. I don’t want to just chuck them in the trash.

I’ve been wondering if I could sell the hard drives and memory on some site somewhere like Swappa that’s offers some level of protection. Anyone know of any site like this? I suspect that the price for these are probably not worth enough to sell, but it’s worth checking it out.

And how can I recycle the other bits so that they don’t end up on a landfill?

On a related note, whether I sell or recycle the hard drives, how can I erase and reformat the drives so that the data can’t be recovered?