eBay is the king in online auction sites. I've done over 200 transactions through eBay and have had a very positive experience so far. It's a good idea to find eBay stuff imaginable about popular new items, such as unlocked smartphones, to a $ 1 million castle on your island.
If you are the first timer eBayer, I would suggest bidding on a small inexpensive item to get used to completing the process (bidding, payment, and feedback). This process will hopefully increase your eBay ID with feedback, so buyers and sellers will be more confident about what eBay you are.
There are some things to keep in mind when buying and selling on eBay.
First of all, I would be cautious or avoid international sellers (outside of the United States) while you are an experienced eBayer. There are many inputs and outputs for international shipping costs, customs duties, taxes and other details that make it uncomfortable for overseas transactions. In my first purchase, you need to shoot for a seamless transaction and stick to an item that is currently in your home country.
Secondly, you really need to know about the bidding that you bid (or sell on that case) and make sure the batch on the auction is really the same. A little online research will save you a lot in the long run if you have any doubts. By searching and modeling items, and by searching for other important information about selling or purchasing, you can reduce the risk of buying things you did not want. If you're still not sure you can contact the seller directly and ask them (usually about status, size, and age).
Third, check out the seller's feedback and previous customer feedback. The Feedback and Comments section really tells you what to expect if you need to buy something from that individual. Also, do not forget to check delivery costs as you will pay for what you publish on the merchandise page. Many eBayers take delivery costs on reliably low-priced items to increase their profits, which in some cases may be objectionable.
Finally, have fun. There are very few items I can not find on eBay. This is a truly wonderful resource for saving money, collecting and monetizing.