Welcome to SoM.
There are legitimate spells here, as well as spells that do not work. The key to determining what is what is to use common sense, logic, and rationality when looking at a spell.
Does it seem too good to be true? Does it seem impossible? Does it look like fantasy magick? If you have a sneaking "yes" suspicion to any of those questions, move on to a different one. Or hey, learn to write your own! Most people tend to think spells you write yourself are more effective for you anyhow.
If you need any help, give me a shout. Happy casting.