We do not plan on supporting built-in quizzes, surveys, or course completion certificates within Teachery courses. This, however, does not mean you can't use these features if you have your own solution!
If you want to embed a beautifully designed quiz within your Teachery course we highly recommend using Qzzr.com. They have free quizzes and are embeddable within your Teachery lessons (just like videos, images, etc).
Google Forms is another option for creating a quiz.
We also recommend TypeForm as an additional option. You can check out their Typeform Quiz product page here.
All three of these options would embed nicely in any lesson within your course in Teachery (just use the Add Content button and add the embed code).
You can easily create your own course certificates using Google Slides, Powerpoint, Keynote, or other certificate-creation programs. In Teachery, you can include these certificates as a link in your Course Completed email (an email Teachery sends to your students once they complete a course).