Keyword Density...
It's important you article has enough keywords...just don't overdo it!
As a rule of thumb, your article should include about 10 - 15% keywords.
The right amount of keywords in your article will help your site rank with the search engines.
You will have to judge what you think is too many and how whether is there is enough. Use your common sense and make sure your article flows well for the reader.
If you are using Yoast, this will sort it out for you.
Once you finally get a visitor to your site, it is very important you don't turn them off with too many keywords...this will also be noticed by the search engines.
Too few keywords, and you might get ignored by the search engines!
Remember Goldilocks and the 3 bears!
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Good Article Content...