With the master key, you can change all the keys, including the master key.

This is the theme of this very useful blog post. And the second beautiful thing that Sir @exyle have mentioned is:
Steempower is the best security.

This is the beauty of this awesome platform, that seniors always take care of juniors. They spend time just sake of awareness towards community. I have been following since last 3 months and I got lot of useful things from here and also I have learnt various things which give me experience and now I can handle each and everything. All the best for your superb work. And Stay blessed. Say hello to wagon!
Vlog 186 is really a great guideline specially for the newbies. Going to share with my family and friends. Thanks @exyle!