How to make professional app

how to use all block section

What do you mean? :thinking:

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First you should sketch your app idea, do market research, make graphic design, create mockups. It’s okay to look at other apps similar to those you want to make. I’m working on an OBD application and my so-called role model is this one https://play.google.com/store/apps/details?id=com.motordata.obd, really nicely done.