Dear Deepa ji,
Your superior told you to go through the labour laws and case studies under it.
You are new in the field.
You need to first find out what labour laws are applicable to you and understand main features of the applicable labour law.
Docs related to labour laws are the Bare Act. Purchase it from market (book stall) latest edition. Labour Law Agency comes out with new edition every year. It is not so, labour laws amend every year but advisable to purchase the Bare Acts every year with new edition. I do it. Don't depend on labour department websites or any other websites. You will find all old and out dated version on websites.
You can not read all the Acts overnight. Once you study the main features, you can go through main provisions of the Acts.
You will find tips on the main features and main provisions in every Bare Act in its beginning. Additionally, you can read some guides or Handbooks on labour laws e.g. Labour Laws by SR Samant. You can also go through below given links but check the updates. Keep the Bare Acts handy when you need to refer any update or any section.
https://www.google.com/url?q=https:/...tTt_hKR8O1jJXA
https://www.google.com/url?q=https:/...h1xq9H8pb7qIPQ
Enjoy learning experience. Good Luck.