Are there any rules regarding adding meta tag keywords? Like adding too much repetitive keywords? For example, let's say I am working on a website on Katy Perry. Can I put in meta tag like this? katy perry, katy perry biography, katy perry pictures, katy perry music ... and so on.
Google don't even take meta keyword tags into consideration these days - I wouldn't even use them. Meta description is important though.
Keywords are still important for other search engines, but it's not a good idea to repeat as many times the keyword.
Why you will use repetitive keywords? Does it serve any purpose. Do some keyword research and add keywords relevant to your page. Yes, Google does not care about meta tags accept the description meta tag which they show in the search engine result page.
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