▷ I need Homestuck help! please?

Okay so I’m in Act4 and it is the most confusing by far and I want to make sure I didn’t miss anything important that will leave me completely confused in the later chapters. The things I don’t understand: The sleeping dream state/awake, in the scene Jack: ascend what the heck happens? and how come Rose was in the Evil purple town (though I think she is asleep.) and This belt or meteors. Is there like a map of this giant place because frankly it’s enormous. Please if you could just answer this or message me. Thanks :P