Thus, the green line shuttles connect terminals 1, 2A and 2C (running from 5:00 to 00:00). The blue line serves terminals 2A, 2C-2F (from 5:00 to 23:45). Yellow Line buses run between terminals 2F-2E-2G-2F c 5:30 to 21:45, and Red Line buses run between terminals 2G-2E from 5:30 to 02:00. All shuttles are free of charge.
But to move between the three main terminals (T1 - T3), you will have to use the CDGVAL train (also free of charge).
Baggage
Everything is easy with luggage if you are flying with the same airline or companies that are members of the same alliance - in this case your luggage will be checked until the final point of your trip, and there will be no need to re-check it at the transit airport.
Another thing is if you purchased separate tickets, say, not only to Paris, but also from Paris to a third country or on a domestic flight from another airport. In this case, you will need to collect your luggage and then check-in again and drop it off before boarding. Therefore, our advice to you: if you buy tickets and connect flights on your own, and not through a travel agency or booking service, it makes sense to allocate more time for the transfer (at least two hours), because there may be queues at check-in/passport control counters, and the airport is not small.