If someone answers your question or provides a helpful response, please take a second to LIKE that reply. It's a nice way to say Thank You to someone that helped you out.
You do that by clicking on the little heart at the bottom of a post (either topic or reply).
And if you're looking at a thread and see a good answer, please feel free to LIKE that. Anyone can do it, not just the original author. And yes, you can like multiple threads in a post.