Documentation.
Ordered by what you do first. Every page states what you need before the first step, and what the finished state looks like.
Start here
Create a key
Open the pricing page and start on Basic. A key and a project are the whole account.
Pricing →Install the tracker
Put the snippet in the head of every page, or run the edge proxy on your own domain. First-party collection keeps the request on your hostname.
Install →Confirm the first pageview
Load one page, then open the session list. The pageview arrives with its path, referrer and device fields. The checks sit on the tracker page.
Checks →Docs index
One script, one key.
One script in the head, one key in the project, one pageview to confirm the install. The edge proxy and the server-side feed are documented on the same page.