I have no prior knowledge of bigdata or hadoop ,but i am aiming towards HCA exam but i dont know how to prepare for it .
Can someone kindly guide me as for what path i should choose in order to prepare for HCA exam . what books i should read ? are there any relevant online courses ? any video lectures ?
I would recommend going through HDP Sandbox, which covers the installation of Ambari + Hortonworks Data Platform as well as several tutorials and guides to learn Hadoop administration mostly from the scratch (although some good Linux skills are needed, of course): https://hortonworks.com/products/sandbox/
With regards to books, a few colleagues have recommended me the book Expert Hadoop Administration, by Sam R. Alapati: https://www.bookdepository.com/Expert-Hadoop-Administration-Sam-R-Alapati/9780134597195
Regarding videos, here's a few good ones:
Interesting TED Talks on what is BigData (mostly informational but interesting enough):
Overview on what is Hadoop (by Hortonworks): https://youtu.be/6UtD53BzDNk
Overview on Hadoop Core components (by Hortonworks): https://youtu.be/a0hY3pyWQ4U
Overview on Hive (by Hortonworks): https://youtu.be/Pn7Sp2-hUXE
Series of videos about the Hadoop Ecosystem and a detailed view of its components (by Cloudera): https://www.cloudera.com/more/training/library/hadoop-essentials.html
Hope it helps!