To install Google Analytics on your website you don’t have to use Google Tag Manager. However, there are few benefits in using Tag Manager, as with Google Tag Manager it will be easier to add new tracking in the future. Even from third parties. If you aren’t familiar with Google Tag Manager, view what is tag manager article.
Flexibility between departments
Usually it is up to the IT department or developers to implement new tracking codes on your website. With Google Tag Manager they don’t have to be no longer bothered. The analytics team will have their own access through the Tag Manager dashboard to add new tracking. On top of Google’s own products, there are a lot of third party tags that can be added as well.
View video on how to install Google analytics with Google Tag Manager