Useful links - Gizra/UX-UI GitHub Wiki

User testing

https://www.usertesting.com/

https://www.youtube.com/watch?v=aqC8NhPPbQw

The fake door approach

https://hackernoon.com/fake-door-the-mvp-before-the-mvp-61197ed264a3

Examples of good emails

https://reallygoodemails.com/