hello i I think you should read Bhagavad Gita it is the best not best it is the best very very best book of the world . very knowledgeable book and its give you more energy and good knowledge about the all moral of this world.

Is Rabindranath Tagore's masterpieces written in Hindi or translated into Hindi?

I love them very much.

check out this video, its gonna help you alot in leaning hindi

https://www.youtube.com/watch?v=cxFiXA-Q0F0

https://cs7050.vk.me/c404131/u132736096/docs/bce9b5c791c2/Aryao_ka_adidesh-Aryavarta.pdf?extra=1oTqLco1t_EXz2GHllo0Ouwuvi_tXIBh8fkjm9luUTCNhl8MECMowAxgOP-aB6Cxd9UIkFKodLBzsqojNts1k3bsFQkvHMRO&dl=1

You can read about the Great Chankya. He is one of the greatest teacher of the time ever found. His achievement of making a ordinary cattle boy into Chandragupta morya as a greatest king, having largest ever empire in India, is very interesting. You will learn about the greatest past , greatest teacher and many more thing all together. 

Honestly , I'm not a fan of reading books, but i can tell you one of the best series to know about him. Please have you wonderful time to look at this link : https://www.youtube.com/watch?v=w-_F2o_Eex4