Why do you study freight transportation, do you plan to go to a job related to it? I don’t really understand all these papers, but I started working as a carrier a month ago and I even googled what a freight bill is and read on https://gettransport.com/glossary/freight-bill that it is a detailed invoice that a freight carrier issues to the shipper of the cargo. It simply lists all the costs for tariffs, fuel and other services related to delivery, as well as details about the size of the cargo, its weight and route. If you are interested in anything else on the topic of freight transportation, you can ask.
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