title: How to use Google tags in Nuxt.js
body: <p>I'm on Nuxt.js 2.13 and I want to use Google tags in my project.</p>
  <p>But there are several things that are not clear to me!</p>
  <p>First: there are two packages by pi0 in Nuxt.js community, <a href="https://github.com/nuxt-community/gtm-module" rel="nofollow noreferrer">@nuxtjs/gtm</a> and <a href="https://github.com/nuxt-community/google-gtag-module" rel="nofollow noreferrer">@nuxtjs/google-gtag</a>. Which one should I use?</p>
  <p>Second: How can I use <code>dataLayer.push({'varName':'value'})</code> with these packages? As in their documentation they only instructed about <code>push('event')</code>.</p>