To run Google ad campaigns successfully and/or see the website traffic analysis, you need to add google analytics site tag info in the header.php of your WordPress template theme.
Here’s how to do it;
First of all, grab the Site Tag from your Google Analytics account;
Next, in the WordPress dashboard, click Appearance –> Theme Editor
Under “Theme Files”, click “Theme Header” (header.php);
In the Theme Header header.php file, right before the ending </head> tag, copy/paste the Google Analytics Site Tag. When done, click the “Update file” button;
That’s about it. Your WordPress website is connected with your Google Analytics for running an effective Google ads campaign.