Alexander,
If you haven’t already, I would recommend you work through this learning path: https://gettingstarted.mendixcloud.com/link/path/38 This covers the basics of Mendix in a thorough and structured way. In addition, for a deeper dive in microflows, you could follow this path: https://gettingstarted.mendixcloud.com/link/path/6
If you’ve completed those and have a more specific question about microflows you are trying to create, perhaps you could provide more details about what you are struggling with and what you’ve done so far?
Hope that helps,
Mike