I am a beginner

I am a beginner who just started 'App Inventor'.
I'm still unfamiliar with using another computer language (C, VBA) a long time ago.
How to send/receive sql data to/from external web server using App Inventor?
Which 'User-Interface' of 'Designer' should I use?
I'd like to get some experienced help.
sorry for being annoying.

This is as good a place as any to start


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You can also watch this YouTube video.

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It's worth your time to do some of the tutorials, to get a feel for event-oriented programming and how to manage user interaction.