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We have 4 types of key including master key, but key required for this trial is p. Posting key, which gives access to post, Comment, claim reward, upvote and no access to any kind of money[sbd/steem] transaction, so it's kind of safe.

Can you define "kind of safe"?

Like if I have you private posting keys and I start using your upvotes and start posting spam comment with your profile, then you have an option to create a new posting key using your master key. So even in worst case your account in your control. Hope it helps

Thank you for that explaination.

Wow, i think that scared me a bit.