MonsterInsights is the best way to install gtag.js on WordPress even for a non-technical user. MonsterInsights plugin can offer numerous functions, such as: 1. eCommerce Tracking using WooCommerce or Easy Digital Downloads store.  2. Ads Tracking to know who’s clicking on your social media and Google ads 3. Custom Dimensions to track authors, tags, categories, and more 4. Form tracking to analyzing WordPress form views and conversions.