What are common GD topics in nitie?

There is no such thing as “common topics” for GD. The GD topics are given by the evaluators or moderators based on the activity they were involved in or what is their preferred area of expertise. So it can be from any topic and any area they deem good. Thus it is completely a personal choice and you can never accurately predict this.

So do not try to narrow down some topics beforehand as it is literally a waste of time and energy. 

• The more intelligent approach would be to keep track of major events from the past 4-6 months through the news. 
• It is often seen that the topics which are trending in recent news are often GD topics. 
• Thus you should be up to date with the latest happenings around the world.
• Alternatively, you can join a coaching institute like TIME and get some mock GDs to get acquainted with the process. 

One of my friends during his time got the topic of “Is India discouraging women from getting education and jobs?” This went on for close to 20 minutes and there were three panelists in the room. Lastly, I would suggest that you focus on learning about recent events.