Keeping it neat.. Down there

This isn't much of a sex nor love thing. But I couldn't think of any other categories to put this post..

So:

Could someone please explain the different ways to keep it neat and clean down there? I'm seriously confused about how to trim down a full bush and I'm worried because i want to keep everything sanitary. Any tips for a clueless teen who doesn't want to get the vajayjay infected or anything?