Briefly, industrial relations is maintenance of relationship between employers, employees and the Government, including inter and intra groups, with a view to maximise production/productivity from the employer's perspective, employee welfare & satisfaction from the employees' perspective and administration of a welfare state from the perspective of government, may be with intervention of the government or otherwise, keeping the human resources in front. Thus, through interaction and mutual trust amongst the employer and employees, better harmonious industrial relations scenario is created resulting in higher productivity and employee satisfaction with better standard of living in the Society.
In order to ensure better industrial relations scenario, the Government has enacted various legislations for regulating the employers/entrepreneurs, social welfare of employees and even welfare of the Society in general. It is, therefore, necessary that you refer to what you studied and try to apply them in practice based on the circumstances. Over a period of time, you will become an expert through consultation, debate and application of various laws in different situations.
Best of luck.