Someone give me info on this script. I put all the parts I do not understand in BOLD. Please someone explain what the parts in BOLD does/mean. Thanks!

#!/bin/bash
#Usage: cmdArgs.sh arg1 arg2 arg3
printf "The number of command line args is: $#\n"
declare -i counter #Not strictly necessary to declare
echo "The name of this script is: $0"
let counter=1
for x in $@
do
#Test if the argument is also a file
if [[ -f $x ]]
then
printf "The Argument is also a file... "
fi
echo "Argument #$counter is: $x"
let counter=$counter+1
done
if [[ $# < 1 ]]
then
echo "You need to add some command line args"
exit 1
else
echo "Done!"
fi
exit 0