Please provide full answer with comments me to better understand material thank you

First screenshot is main.cpp second card.h third deck.h fourth hand.h fifth shuffle.h and 6th main.cpp

If you help me with this will be greatly thankful

Download the starter code main.cpp, card.h, deck.h, hand.h, shuffle.h, and deck.cpp. Do not modify the header files. We have provided main.cpp to give you an idea of how we intend to use the functions. Put the implementations into the files card.cpp, deck.cpp, and hand.cpp. Other cpp files must not contain a main function. You may not use any libraries aside from iostream, string, and cassert. You may not use global variables. We may take off up to 20% of the total marks for poor style; make sure to name your variables reasonably, indent properly, and comment sufficiently. Submit card.cpp, deck.cpp, and hand.cpp