Need help on understanding "Pass Only When Safe" section in NJ Driver Manual

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Hello, I am studying NJ Driver Manual on my own, and I am having questions arise from my own studying. Here is a few that I would like to confirm with. Please note that the questions are more into comprehension question as my English isn't very good. So I have stupid and weird mis-comprehension on certain things. Anyways, here is the quote and questions. This is the original text from the book (for reference and context understanding) "Most passing should be made on the left. Pass on the right only on raods with more than one lane going in the same direction if vehicles on the roadway are moving in two or more substantially continuous lines, or if the driver ahead is making a left turn. New Jersey law prohibits passing on the right shoulder of the roadway." My Questions: What does it mean most passing should be made on the left? Made on the left, does it mean most passing should be made when you are on the left side, and you want to move to the right side? or does it mean you want to move onto left? Same question for the 2nd line. Pass on the right, does it mean passing onto the right side, or does it mean you are on the right side and want to pass to the left? Not quite understand the whole 2nd sentence either. If the driver ahead is making a left turn, and you want to move to the left/right? Please explain. What is "right shoulder of the roadway"? I know these questions might sound stupid, but please help as I want to clearly understand the rules. Thanks in advance.