Hi guys, I'm new to 4chan and I'm trying to understand

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Hi guys, I'm new to 4chan and I'm trying to understand some things.
>when do u use this green text thing
What is top kek
How do you guys keep track of different people in threads? They're all numbers
Why is everyone here so aggressive
How do you post simple text without getting 'not original'
What are some rather normal groups/boards
Do I need to have tabs open to come back to threads
Do you guys have all these pepe images saved or is there a command to summon them