Thanks for writing this tutorial Amir, appreciate it. (We are new to Strapi and just followed this guide)
It would have been more useful for me personally to go into a little bit more detail on the configuration of preview mode.
For example, I see that there is a ‘secret=GwpRUnwb7otnm2InuPeWGYiUNn0TJ8PK’ query in banner.jsx but there is no mention where this secret key is derived from.
How do I turn preview mode on if it is hidden?