A Tag Manager allows you to add easily add and remove things like Remarketing Tags, AdWords tags, etc - without you needing to manually alter every page of your

A Tag Manager allows you to add easily add and remove things like Remarketing Tags, AdWords tags, etc - without you needing to manually alter every page of your site all the time. This allows you to easily integrate with 3rd party services without constant code changes. Generally, you need something on the order of 1,000+ conversions in the test period to have enough traffic to generate a statistically significant result. There are a lot of articles about AB Testing and you should read up on it before deciding it's for you. In addition to the traffic, you need to be able to define a non-biased test, and be able to analyze it effectively.