A Brief Guide on the Uses of the Advanced Search
The first thing you should know is where to find it, directly under the standard button, in the top right of most eBay pages.
From there you can search for items by location, seller etc. The great thing is all the things you can exclude. It helps get rid of all those irrelevant listings that aren't what you are looking for.
Here's where it starts to get interesting. From here you can search through the seller's current and previous, last 30 days, listings. This will give you an idea of what they are selling, and more to the point, what price point they are selling for. Sometimes you'll recognise a pattern of items going cheaper when they finish at certain times.
The new eBay site changes, and some European privacy laws have rendered this one slightly less useful, but it's still quite helpful. For one thing, you can find the high bidder of any item you have bid on, even if they are listed as Bidder 1 etc. in the bid history. Then you can check up on their previous bidding history and perhaps recognise a pattern. If, for example, they always bid $5.01 you can wait and snipe them at $5.02. Or maybe there is no pattern? Usually there is though.
You can also search through your own bidding history, I always find this interesting, and you can see if anyone has been using your account. Or maybe you can see just how much you've actually been bidding on in the last 30 days, it may surprise you.
There are no hard and fast rules, but it's always a good idea to have the most information possible. Always check your seller's feedback and ask questions if you're not sure about something. Infact it's a good idea to ask questions anyway, if they can't answer a simple question, what will happen if something goes wrong?
Anyway, enjoy your eBaying, and I hope you found my guide of use. If you did, don't forget to vote and help me get that icon for 100 helpfulness votes.