App development and web development both are very important today. All depends on what is more suitable for you. If you are the beginner, web development will be easier and interesting for you. You can choose a variety of the programming languages. For example, PHP, Python (Django), Ruby (Rails), and also Java, C# (.NET).
App development is more difficult. In such case, you need to have skills and knowledge about these programming languages and how to use them. For example, Java for Android, Objective-C/ Swift for IOS, C# for Windows Phone.
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Answered Jan 11, 2017
Edited Jan 11, 2017