If you want to create an APP of your own, what do you need to start?

Currently, I will use php, js, mysql, and Linux. If I want to build an APP (for android ). What else do I need? Or is there any material for me to learn? Currently, I will use php, js, mysql, and Linux. If I want to build an APP (for android ). What else do I need? Or is there any material for me to learn?

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Currently, I will use php, js, mysql, and Linux. If I want to build an APP (for android ). What else do I need? Or is there any material for me to learn?

We recommend hybrid apps and write web apps (html5 + css3 + js, jQuery, jQueryMobile, Bootstrap, etc.) and phonegap for fun.

1. PHP. You can look at the Slim framework and learn how to write restful APIs. (learn more about this) Write server support for your app.

2. Let's see what platform you want to write. for Android, let's look at Android development. For ios, let's look at ios development.

Currently, I will use php, js, mysql, and Linux. If I want to create an APP. What else do I need? Or is there any material for me to learn?

The subject describes your problem in a general sense and does not know which application you want to develop.
If you want to develop an Android app, search for online video resources and do some things.