Here is a complete guide on connecting HubSpot with Google Analytics also you can read the benefits of connecting google analytics with HubSpot : Integrate Google Analytics with HubSpot content
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If you’re not creating website or landing pages in HubSpot, there is no benefit in integrating Google Analytics with HubSpot. The purpose of this integration is to collect data on the visitors to HubSpot sites, see here: Integrate Google Analytics with HubSpot content