Google Analytics is a great free tool from Google. While JavaScript tracking is not perfect, Google has eyes all over the web, making this a great industry leading tool for a good price.
However, it is routinely misconfigured; bad information is worse than no information. So its critical to both ask the right questions about data AND configure your data pipeline correctly.
This is work we specialize in along with augmenting GA with additional data like rank tracking, heatmapping, A/B Testing, and session recording. The end result is a robust, well-configured, strategically aligned data pipeline for your business. Additionally we offer training in Analytics to top companies, universities and governments.
The following articles provide information on core principles to get your analytics set up properly and working well for you.