How do I pause my shell script for a second before continuing?

Use the sleep command.

Example:

sleep .5 # Waits 0.5 second.
sleep 5  # Waits 5 seconds.
sleep 5s # Waits 5 seconds.
sleep 5m # Waits 5 minutes.
sleep 5h # Waits 5 hours.
sleep 5d # Waits 5 days.

One can also employ decimals when specifying a time unit; e.g. sleep 1.5s

And what about:

read -p "Press enter to continue"

In Python (question was originally tagged Python) you need to import the time module

import time
time.sleep(1)

or

from time import sleep
sleep(1)

For shell script is is just

sleep 1

Which executes the sleep command. eg. /bin/sleep

Run multiple sleeps and commands

sleep 5 && cd /var/www/html && git pull && sleep 3 && cd ..

This will wait for 5 seconds before executing the first script, then will sleep again for 3 seconds before it changes directory again.