What is the step by step procedure of transfer from international terminal to domestic terminal at Newark Airport?

I am an Indian Citizen and I will be having a negative Covid Test report with me. My flight is United Airlines from Bombay (BOM) to Newark(EWR) and going to Boston (BOS) via Chicago (ORD) via a connecting flight ( 2 connecting flights to be precise).I need to know the step by step procedure and mainly about the baggage transfer because there are 3 big bags with me (So, I don't want to carry all of them around everytime) and also about the Immigration procedure. And also can I change my flight from Newark directly to Boston rather than going via Chicago?
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Do I have to go through customs for a connecting flight in Newark?
For international arriving passengers, you must claim all checked bags at Customs and recheck with your departing airline, even if the bags are checked to your final destination!Can you walk from Terminal A to C at EWR?
Terminals A, B, and C are not directly connected to each other via any walkways or bridges, so passengers must ride the AirTrain or shuttle bus to connect.How do you get from Terminal A to Terminal C in Newark airport?
EWR Terminal C Detail You do not need to re-clear security to travel between Terminal A and Terminal C. United operates a frequent shuttle between the terminals. In Terminal A, you can catch the shuttle near Gate A28 \u2013 just follow the signs and go down one level to the ground-level shuttle boarding area.Do I have to go through security again for connecting flight?
For connecting domestic flights, you almost never have to exit and reenter security, though there are some exceptions at airports where the terminals aren't all connected. For domestic-to-international connection, it's still pretty rare that you have to exit and reenter security, even if you're changing terminals.Newark airport how to change terminals
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