how can I use all scripts from custom folder like native shell commands in macOS [duplicate]

I am learning shell scripting, and I have written two scripts one that copies many files at once to a folder and if the folder does not exist it creates it, works like a charm! You may use it :D and the other one that moves them, I mean cuts and pastes :)

to copy:

#!/bin/bash

if [ ! -e "$2" ]
then
    mkdir $2
fi

if [ "$3" ]; then
    cp -rn $1/*.$3 $2
    echo "Copying *.$3 done!"
else
    cp -rn $1/*.* $2
    echo 'Copying done!'
fi

to move:

#!/bin/bash

if [ ! -e "$2" ]
then
    mkdir $2
fi

if [ $3 ]; then
    mv -i $1/*.$3 $2
    echo "Moving *.$3 done!"
else
    mv -i $1/*.* $2
    echo 'Moving done!'
fi

I would like to be able to use them like any other shell command (eg. ls, ping, cd...) everywhere in my system. How can I achieve that? Thanks!