https://steemit.com/steemit-guides/@rgeddes/getting-your-posting-key---made-easy
good thing you asked - I didn't know that either.
If you have a question, a lot of times you find answers if you click on the search icon top right and write in a search query.
I do have a problem with my posting key: I store my passwords in my Norton Vault, and under Steemit and my username, I can only have one password. I was going to enter the posting key and then added the url and my username, but Norton would not let me do that. I got a pop-up from Norton saying I have to put in a different username since this one is in use already. Of course, that wouldn't work, so I am stuck with having my posting key on a text file (now, how safe is that?)
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read more about it here
https://steemit.com/steem/@shenanigator/updated-steemit-faq-section-security
your long password that you receive when you first activate your account is very important to keep in secure vault since if it's lost it can not be recovered. I use LastPass it has mobile app to store all my passwords securly. Even LastPass do not have access to the passwords, its highly recommended. You can get free month premium if you use my invitation link https://lastpass.com/f?9780236 it's $12 a year. You can use it for free after that. I believe mobile is free. Not bad. Also read about 2nd factor authentication. This adds extra mechanism of authentication to make it a little more difficult if someone tries to access your account.
Thank you.