All already implemented by bazillions of libraries.<p>Sure you need to know when to use them but not how they works or how they are implemented as long as someone who specialize in this field already checked them.<p>And if one day you need to use/modify/adapt one of those or even another algo you can still learn it at that time.<p>EDIT: I'm starting to think I misunderstood you and that you basically said that you should just know of their existence and use ?