SEO (search Engine Optimization) is very important for the success of websites. Search engine play a very important role for increasing the traffic of your websites and Keywords are a very important part of SEO. Keywords are the main tools in standing high on search engines. If you will neglect them then you will suffer the penalty.
You can add the keywords in your ALT tags, anchors and other areas. Whereas these are intended to be used if you would like to increase your keywords, they should be important to the image or the place where you are linking. Lots of public make an effort to stuff keywords into each possible place. But there is no advantage at all in doing this.
There is common rule; you can use 3 or 2 keywords or phrases for optimizing one page. I think one or two keyword is better. It’s depend on your percentage of keywords in your text should be between three and 5 % of the whole content on the site. If you do a proper on page and off page optimization of your website, then your site can also come on top. You can also use some online free tools for keyword searching, keyword density checker.
I have seen on huge mistakes on some website, they are repeating the keywords on keywords tag more time. But this type of things will not helpful for your website and also on thing use your keywords in your page title tag and description. It will help to improve your keyword ranking.