There are few old, but still worth reading posts about that matter:
@pfunk's A Full Steemit User's Guide to Steem Witnesses
@steemitguide's Steemitguide: What Exactly is a STEEM Witness and why every User should Vote!
@teamsteem's What Are Steem Witnesses And Why You Should Support Them!
@timcliff's Witness Voting Guide
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I'm new here and I am grateful that many people here are so helpful in spreading knowledge. Thanks for the links.