Google Tag Manager is becoming more and more common to setup and implement on sites. This is a more streamlined way of putting all your tags (tracking codes) into your site. Codes like Google analytics, Google ads (PPC), Facebook Pixels, etc. You can have just one code (tag manger) on your site that will track all those codes in one location offering a number of benefits. Here’s a great overview if you are interested: https://blog.hubspot.com/