Pay attention to the trash. There are pretty useful pictures; but if you can’t figure it out, just watch the other patrons and follow their lead. Just remember that the Taiwanese tend to take recycling very seriously, so make sure you do your part.
This year, many people might be traveling to Taiwan for work, school, or vacation. I put together these guides a while back, when the memories were fresher, and they’re handy for people who’ve never been to Asia. It can definitely be a little shocking; toilets aside, there are many things that can stump a foreigner. Hopefully these will help you.