Hi dear Arijit, welcome to Steemit world. I hope you will enjoy this platform. Firstly you have to subscribe here: https://steemit.com/trending/hive-172186 and after that click "new post" to share "Introduce Yourself" post. After that, you have to write a post in Newcomers' Community to introduce yourself in more detail (add some photos about you or your city). Then, you can follow and subscribe to other communities maybe about your country or your interests. You have to follow the same rules for these communities also. Good luck:)