Show me the ropes of 4Chan

Go to b and dont become cancer like any newfags, just lurk

No one's going to be able teach you everything there is to know about 4chan in one day, it's impossible.

You're new here, so make sure you do 3 things:

1. Be sure to read the rules (all of them). Despite what some other faggots will inevitably insist on otherwise, they actually do matter. It only takes 10 minutes anyway.
You can read them here: https://www.4chan.org/rules

2. Read the FAQ. It contains a lot of useful information, like telling you how to use the in-built image search feature on 4chan if you want the sauce for a pic that was posted.
You can read the FAQs here: https://www.4chan.org/faq

3. After you've completed steps 1 and 2, you're now going to do something called "lurking". That means you go and observe boards without posting anything. Look at the board options available and see which ones interest you (it helps if you browse with frames (http://www.4chan.org/frames). Visit the boards you're interested in frequently and get to know its board culture (each board has its own unique culture), and get comfortable with it before making any comments (you could still certainly post pics if you want to). I would strongly advise you get used to board culture before posting any comments; if you say something they don't like then it's often met with hostility. It's not completely bad, people would still talk to you, you'd just have to do it while being showered with shit from different directions.