By asking you're already doing better than some.
Your job since you're here is to learn is to read the collected wisdom, separate fact from friction in the argumentative threads, and when you feel comfortable - start answering questions from people with less experience than your self. Accurately of course.
Don't worry too much about the last item. Someone will jump all over you if you're wrong.
The best tip I can offer is to learn to use the Search feature.
Since there have been over a million posts, most questions are asked and answered many times. Occasionally the correct answer evolves over time or someone asks a specific question in such a fashion that the answer requires amending. To me, that's a wonderful thing.
The next tip I'll offer is to say something is your opinion unless you're prepared to cite the source of something controversial.
In my opinion, essentially everyone who posts has been wrong about something, and been corrected. I know I have been wrong or my experience varied wildly from somebody else s. Other then the chagrin at being shown up as wrong, I've been happy to accept the help/criticism/correction. I came here, and stay here, to learn from people with more, other, or different experiences than I have. Or could have.