1. Learn a Programming Language
Opting a specific programming language can be little complicated as any computer programming language is not perfect right now thus you need to make sure that the language you are going with supports Android Development. In my point of view, if you are complete beginner in android, then go with Java Programming Language. It's one of the easiest and quite powerful in terms of building android apps. Other options are Kotlin, Dart, Javascript etc.
2. Choosing a right framework
One important thing to note is that programming languages like Dart, Kotlin, and JavaScript have their own framework so you cannot proceed with one framework with any programming language. Likewise, if you wanna go with Dart then you will have to work inside Flutter (Framework of Dart Programming Language) or if you want to go with JavaScript, then you would have to learn React Native (Framework of JavaScript).
3. Learn any Database Concept
In modern world, a person who don't know the basics of database stands nowhere in computer technology. Database is a backbone of any application where it is a web app or android application. You must have to learn the concepts of Relational Databases that are also known as SQL Database. The NO-SQL Databases are also in the market. The basic difference between SQL and No SQL is that SQL works on Tables, and keys whereas No SQL works on Json format. I recommend my readers to learn either the Firebase or MongoDB.
4. Learn designing User Interfaces
The user interface is one of the essential thing for any computer application. A programmer can successfully transform his idea into an Application only if he knows how to design a User Interface that is helpful while using the application. Now, in order to learn the designing of UI, I would recommend you to watch the UI tutorials on YT and get the basic concepts of it. For tools, there are many UI Designing tools available in the market, although some of them are not free. But using Adobe XD, and Sketch App is highly helpful in designing the UI of any app.
