Where Should I Start Coding
The shortest answer to this question will be the Algorithm. You can start by learning the algorithm. It is very difficult to do coding without the algorithm. It is much more difficult if the program we are going to encode is large. So you can start programming by learning Algorithm.
With the algorithm you can build the logic of the program's work. You can code more easily when coding the program. You know how to proceed. Generally, C programming is taught first in schools. If your target is different, such as encode Android. Then you must proceed according to your goal. I like to learn Java and Kotlin.