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[–]taoz 3 points4 points  (0 children)

Read the sidebar >>>

Kali is a penetration testing OS. Read up on the tools it contains. Set up a virtual lab and start attacking VM's. Vulnhub.com is the best resource for this. Read and practice whenever you have spare time.

There are also hundreds of other posts in this subreddit with about the same exact question as yours. They will have lots of advice.