basic make usage 
what is a Makefile
make clean
make easylogging++.o
look at output when you type make, same commands you would have to issue




basics of scope and variable lifespan

what is pass by reference   

when a function returns NON void , make sure to use it
when a function returns void , make sure NOT to use it

read only variables versus  pass by reference

explain copying over just one file from the source directory