Well, it is true that keyword is very important part of any website as most of the websites depend on search engine optimization, if you haven't chosen the right keyword then it may not help you a lot, and you may not understand where you started and where you are going to end.
Try to give time while researching keywords, understand the competition first, also understand that what biggest techniques your competitors are using for ranking those keywords as you may also have to use those techniques as well.