For any project that anyone creates these days (myself included) you want to see how many visitors your site gets, where they come from, what they clicked etc. The easiest and cheapest way to do this is obviously Google Analytics I think that 99% of websites out there have Google Analytics embedded into their code.
I am no different, I wanted to see how the users were getting to my site, what they clicked, how long they were on there for etc. etc. So I added Google Analytics to my site too... Which was really cool and free, but the longer I used Google Analytics I felt that I wanted more insight. Like what if I could actually see how users interacted with my site.
I came across FullStory and this is exactly what I wanted, it will record all your user sessions and you get to replay them in full. So you can see exactly how a user uses your site, what they click, and see if your site might benefit from some A/B tests or changes. - I am on the free plan, so it doesn't need to cost you a fortune.
Both Google Analytics and FullStory allow you to login with your G Suite account which helps you keep your accounts all linked.
With FullStory and Google Analytics I feel that I have the perfect insight into how the users are using my site, and all the analytics around how they get there. Its a perfect combo