Selecting your adwords keywords

CaptainPwnage

New member
Feb 8, 2010
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Hey guys,
I am wondering about keywords in Google Adwords, should you add every relevant keyword which you can find to an advert? Google recommends 10-20 keywords but (for example) what if I can come up with 500, is there some disadvantage to putting them all in?

The reason I ask is because I am having trouble understanding the keyword side of split testing, if you find a relevant keyword wouldn't it be better to place it within all of your ad groups as opposed to testing with some and not others?

Cheers in advance.