Resolved: can you give any advice to understand this terms well

Hi G Keerthi!

Thanks for reaching out.

You needn't feel obliged to memorize all these terms by heart yet from the beginning of our Program. On the contrary, the idea of this entire approximately hour-long introduction is the present you an entirety of the terms and buzzwords people use in the world of Data Science. Later, throughout the courses, you will be referred to the terms that you need in order to complete the given tasks (e.g. certain terms you will hear while learning SQL and relational databases, others - when learning Python for Machine Learning etc.). The idea is that you should always be able to go back to this introduction if you need to refresh some of your knowledge or when trying to recall what part a certain term would take in the bigger data science picture. 

Hope this helps.
Best,
Martin