This guide explains skill points and traits and why trait points only work occasionally--"...every five points invested nets you a trait perk."
http://massively.joystiq.com/2012/07/31/flameseeker-chronicles-guild-wars-2-skill-points-traits-and-y/
This guide is a bit briefer and only covers traits.
http://www.guildwars2hub.com/guides/basics/complete-trait-system-guide
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