more elaborated question is, what's the good number of keywords to be used that is not too little or too much for all major search engines?
you good question ask .so keywords google limit 4-5 time bar only and more and repeated so your site dumb and spam.
I just want to ask about that, for the exact question is: I have research my site and there is many keyword result (not repeat), so how many keywords to be considered to put in the meta keywords? Thank for the help.
There is no limit - you can put as many words on your page as you see fit. I think if you put too many it dilutes the impact, though.
really? so SearchEngines dont look at meta keywords? Do Search Engines use only the first x number tho? or do they think you are trying to spam if you use too many that it lowers your chance?
The keywords meta tag has so little value these days that it's not worth worrying about it too much. Just choose your most important keywords/phrases and stick them in there
Title tag, followed by header tags, then maybe bold and the alt attribute of images. Of course the Anchor text of inbound links holds lots of weight.
for me just use 3 major keyword and 2 minor keyword for meta tag....... although SEs no longer give too much importance to meta tags, they are still useful tags on your pages.
The truth is, nobody really knows 100% for sure which search engines use the tags for what. If it was that obvious, then it would quickly become devalued. Just put in common sense keywords for whatever your page is about, but not too many. Look at pages on highly-ranked websites and follow suit (at least, similar length and style) and you won't go too far wrong.