Couple of beginner’s questions [closed]

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  1. Check this: Check this: https://premium.wpmudev.org/blog/daily-tip-how-to-automatically-set-the-featured-image-in-wordpress/
  2. http://dominiquej.com/how-to-delete-uncategorized-wordpress/
  3. No, 301 redirects will typically not impact your performance in the SERPs negatively when done correctly.
  4. Please specify your question.