My Home Network

I learned that one modem gives connection to all my devices in my home.  My modem is a phone jack and we always have a phone number.  The wifi gives connection to most of the things in my home.  I also learned that the placement of the modem doesn't give me good signal in my room because it doesn't travel through concrete walls very much.  My modem is a dull band modem, 5 ghz and 2.4 ghz.  I also didn't know that the coaxial cable gives my modem a signal and converts it to internet.