Basically, If it's related to a thread that already exists, than it goes in that thread. If it's general chat, it goes in the lounge or via pm or gtalk. If it's a new idea, or a question that hasn't been asked before (use the search button) than go ahead and create a new thread. I think that the decrapifying of threads has caused some newer members to be afraid to create a new thread. That shouldn't be the case. If you've searched, and it's not related to another question, than by all means, post it in a new thread. Nobody will flame you for asking questions on how to avoid bricking your phone (and in the extremely unlikely event that someone does, many more members will come defend you. We don't like trolls). Even if the questions are nooby, if you've honestly tried to find whatever you're looking for and haven't been able to, go ahead and ask. However, if it is related, post it in the relevant section.
This wasn't meant for one specific user so much as for anyone who's new.
Edit: I forgot Double and triple, in rare cases, quadruple, and in one case I remember but can't link too (guys, anyone remember the link, it was a 2-5 page thread I think) somebody posted 3+ pages worth of posts. There is an edit button. Please use it. Scrolling through 3 pages of one user made my eyes bleed. If you want to quote multiple people, there is also a button that looks like this
"+
click that on the people you want to multiquote, than click quote on one of the people. There, you've multiquoted.