Also, use the tools the site gives you. If you’re reading an old thread and think, “hey this made me think of something similar”, don’t post a reply in that thread. Instead open a new thread, optionally with a link back to the old one.
Specifically, instead of clicking the reply button, click the
“link” or “share” button and then click on + New Topic to make a new topic related to the old one. Please do this on not-that-old topics as well, it helps prevent derailing of discussions.