How to track website conversion?

Question

Blogs

Hello!
There is a WordPress blog. On the main page of the blog there is a form for capturing users' emails for further mailing.
There are also several landing-pages that sell and capture emails.
Now the crux of the matter: how can you track users at different stages? Those. how to separate the user who bought the product from the user who simply subscribed to the newsletter? So that in the future it was possible to work with different bases.
Thanks

Answer 1

and if he bought and subscribed - what base will he get into?
track GA, Event (including soap clicks) and other E-Commerce
see this section