When it comes to using the terrain to your advantage, there are a few options available to you. Provided you’re not wearing fluorescent clothing, sticking yourself in a bush can be a surprisingly effective way of going unseen, provided you don’t move too much.
Similarly, you can try hiding in grass as well but note that grass stops rendering if you’re looking past a certain distance, so you won’t be able to hide from long-range snipers this way.
Other than that, common sense applies. High ground at the edge of a map usually makes for good ‘wait-and-see’ spots that let you watch the match unfold, taking out opponents when the right opportunity presents itself. Speaking of watching…