Do you want learn how to develop applications for Ubuntu Touch (UBports) ?
Look at my collaboration with Miguel about that at :
https://mimecar.gitbook.io/qt-course/en/chapter-05-advanced
I have written the chapters about "Database access with QML" and "Qml charts" under "Advance qml Concepts" section.
Do you want start UBports Apps development ? Look at my Skeleton sample Apps:
https://github.com/fulvio999/ubports_app_templates
Do you want only use my UBports applications? Look at:
https://open-store.io/?sort=relevance&search=author%3Afulvio
(all the source code is on my GitHub repository)