keyword density is how many time a keyword is used in total words. if a keywords is used 2 time in total 100 words then density is 2%

Keyword density is the percentage of times a keyword or phrase appears on a web page compared to the total number of words on the page.

Keyword density tells you how often a search term appears in a text in relation to the total number of words it contains the high keyword density is good indicator search engine spam if the keyword is too often it will easily downgrade your web site.

Keyword density is the quantity or percentage of keywords phrases or it will be the keywords appears on the webpage. It is the numbers of keywords use on the posts.

Keyword density is the measurement in percentage of the number of times a particular keyword or phrase appears compared to the total number of words in a page.

Keyword density refers to how many times your keyword appears on a page,compared to the total numbers of words on that page.

How many times any keyword should repeated. according to me, 2 - 3% is good for any article.

In SEO, the most difficult part is off-page optimization where you have to build links from other sites. For on-page, you just have to write good articles with enough keyword density. I dont think you should have a problem in this area. The area where there is much problem is getting backlinks, especially one way, from other sites