The status of this response is Pending and require some modification by the author.
I would suggest you to learn Mobile Application development using Xamarian in VS 2017(Both Android and IOS). This IDE will provide a simple way to develop the mobile app quickly. Just learn C#,Xaml and basic coding for SQL (sqlite). You will get lot of support from online forums and many free courses available on Youtube and pluralsight which will provide a good start up.
Ref in Youtube : Xamarin Tutorial Episode (https://www.youtube.com/watch?v=eAZ4kPf5eTc)
Download VS 2017 community edition for free for learning.