This question already has an answer here:

I have one user on WP website. I want to give him editor role because he need to edit pages and as I see - edit_pages capability requires user to be at least editor. The problem is that i want to limit list of pages and posts that he can edit. How it can be done?

marked as duplicate by Rarst May 5 '16 at 10:09

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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    This kind of question has been asked numerous times, such as here and here or even here. Will any of those help you get started? – Monkey Puzzle May 5 '16 at 7:00
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    thank you - this answer wordpress.stackexchange.com/a/172282/16650 helped me! – moonvader May 5 '16 at 7:44
  • Great to hear! It's funny though, isn't it, that the 'correct' answer linked from the 'duplicate answer' above suggested a plugin as a solution! Blasphemy on SO, but somehow it was deemed to be the correct answer! – Monkey Puzzle May 5 '16 at 23:07