How can you develop great reporting skills?

Always do your research prior to the assignment.
It's important to chalk out what your story is going to be about; highlight the factors and then form the right questions: the answers of which will help materialize your story.
You must know what kind of questions you will ask and you must have a back up in case you don't get your answers.
You must have great presence of mind and the ability to handle situations when they don't go as you expected.
You may use your sense of humor/wit to make the story interesting.

To become a great reporter, one has to be a Proactive in his duty.
He has to be very much aware of what has happened and whats's happening.
His communication skills must have to very well in a position to report his article etc.

First off all you have to prepare yourself. Any time you plan to write a report you have to do a good research and find out about the subject as much as you can. Once you get prepared you can start with interviewing your interlocutor. The main tips to do it well are:

1. Ability to listen the person you talking with (hugely important!)

2. Respect the person you interviewing (to get their trust- don't try to be cleverer)

3. Ask the right questions (right question= desirable answer)- right question sounds probably very subjective but it's vital to create your question in a way that let you to pull out what you want from your interlocutor.

4. Don't stick rigidly to your draft (if conversation starts going into different direction- pick it up and adjust yourself as often you can get sth more valuable from a side conversation!) Try to get opinion from varied sources to avoid being subjective. Your role is to get a picture of idea you reporting not to judge people or situation. Hope it helps:-)

Always stick to the facts. 

First of all need to know / understand the scope & contents of report and be brief to the point.
Do not go in details specially which are not required.

I think read on the subject and you can also try to find online courses on the topic. It depends to an extent on the audience; if they want to see the full story or only the highlights. However, it is always important to learn how to write effective summaries because reporting to a large extent depends on giving the reader the most important points in an organized, shortened format.

Read, read and read more in the sectors you want to work in and through publications and newspapers that you find interesting and which are making a buzz in the market.
See how famous reporters tell their stories ;)

To developed my reporting skills simply just to read some article on the book or in a net about new techniques of reporting, also asking some known expert person.

The best way to acquire this specialty is to study the army's way of "writing an appreciation of a situation".
This method in fact dissects the issue to the hilt and guides you all along.
Then another factor is to edit the report in such a manner that it should not exceed more than two pages