Hi Sudipta,
Luckily, you are starting to learn CP2K now. The website of CP2K,
https://www.cp2k.org/ , provides lots of information to learn it, including HOWTOs, Exercises, FAQs and Tools, which locate on the left hand side of the web page. We all should thank people who contributed to the CP2K website. If you start to learn CP2K in 2013 or 2014, this website was empty...
The CP2K manual, however, is not very suitable for beginner because it is really lack of instruction, only list short description of the keywords and the default values.
Huan
.