The main thing you need to know is what your after and if you find something that draws your attention then you need to make sure it is what you think it is. The second thing you need to do is have a way to find out for sure what it is worth. Then make up your mind what your willing to pay for it and last decide if you want to prebid or make the excitement last and watch and bid as the auction proceeds sometimes this can be as much fun as (WINNING) the item. Remember names can be dropped in a way to make you think your getting a top of the line item when indeed it is a look alike or copy. Also beware of photos, cameras do many things today, some good and maybe some not so good. Check sellers reputation as well and make sure they are up to standards as well (you can NEVER be too careful) Be cautious but have fun and get what you want and need and enjoy it to the fullest.  Ebay offers the chance of a life time on some deals and millions of items daily. Someone out there makes a tool for just about everything and you have a lot of choices as to makes and models, choose below or search all categories.