Change your tracking without bringing in a developer. Provided it stays organised.

One container on your site in which you manage all your tracking: analytics, ad pixels and conversions. New tracking becomes a matter of configuring rather than having it built in.
After a few years, a container holds tags from tools that were cancelled long ago. Every tag loads third-party code on your site: that costs speed and creates a privacy risk. We clear out whatever is no longer used.
Under the GDPR, advertising and analytics tags may only load after consent. You set that up in GTM itself, not in each tag separately — that way you know for certain nothing fires before it is allowed to.
A question or project on this topic?