Information provided at metaphor.org.uk is organised by intention and context . The purpose of the metaphors that you generate is to achieve a specific outcome , to communicate meaning, to do something. You may be more or less making sense of these ideas right now. If you're heavy on the 'less' side, more information about how this information is organised might help. Some people like to do that.
Some people prefer to jump straight in.
Whatever floats your boat, so to speak. I know that some of the most valuable lessons I've learned in life haven't been immediately apparent. When you know where you're going, it's easier to tell if you're on the right path. The first step in choosing the right metaphor is knowing the destination.