It really depends on what you're looking for and where you live. If you're looking for something close to you that you can pick up, I recommend Craigslist or Kijiji because they separate the site into locations. If you're looking for brand new items and don't mind where it comes from or how much shipping will be, I recommend Ebay.
I've always had good luck with Ebay and they now have a new rewards program! I've never used Amazon before, so I can't comment. If you're looking for homemade, unique or vintage items, try Etsy.com.
Almost all of the items are handmade and you surely won't be able to find them anywhere else.
To add to Morena's comment, I have used Amazon and find it to be along the same lines as ebay. I use the site to buy textbooks and so far have had no problems. I do not like that I always receive emails from them with suggestions of other things I can buy.Shop.Com is also along the same lines as Amazon but it is a better run company.
If you are looking so things that may have been used before and are local, they maybe try freecycle? People in your area will post things they no longer want for free as long as you are will to pick the item(s) up.
Thx you guys for the help...well I was more thinking bout putting a couple of stuff that I have for sell but I don't kno which site is better or less complicated.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.