I want to develop courier management software and a mobile app, can anyone please guide me for this. I am a beginner and don’t know much about soft. development. Please assist me which path should I go?
Based on my little academic experience with mobile app, you should think first on which platform you wanna develop it: Android or iOS.
If your mobile app is going to be for Android users, you should learn Java and use Android Studio for that. Also there is Kotlin, which is a new programming language (2017) designed to run on the Java Virtual Machine and also compile into Javascript / Android. If you choose iOS, there is Swift, that you can code using Xcode. You can learn more about it here.
There are other mobile development enviroments like Xamarin - Visual Studio (C# language) for cross-platform, which hasn’t the complete set of stuff that Android Studio / Xcode, so it is harder to start using it.
Let’s see what other users think about it 
nice , but how do i post it globally for world users to see?