See also the related question: Wrote an answer while question got put on hold
This question asks about how to improve in a sport, namely Badminton in India. While the question is broad, I believe a good answer can be written, mentioning for example:
- the rough organization of the sport; including typical structure of associations/club/private training. This is often country-specific.
- a basic pathway in becoming a top athlete, again somewhat country-and most definitely sport-specific.
- Resources to start self-training
- equipment or other considerations
An answer can focus on one or more, but in any case a short description of the typical pathway to becoming a professional athlete would be sufficient to answer this type of question.
For these reasons, I would very much see this question reopened.