I used PHP/MySQL as my backend. Front end has to be HTML (I used Bootstrap for layout).
You need Android Studio and xCode (and a Mac) to package the apps and submit them.
Tutorials for what exactly? Building a mobile app with Wappler isn’t much different than building a web app. It’s all the same principles. The only real difference is you need two projects. One for your Server Connect Actions and one for the app. I was able to build my first app without any difficulty using the documentation that is available.
Just start building and ask questions when you get stuck. 