How many keywords can I add "Meta Description"?

How many keywords can I add "Meta Description"?

By Google guidelines its 2 to 3 keywords used in meta description.

2 to 3 keywords in meta description.

Primary and secondary keywords are ideal to be added in meta descriptions.

only one keyword is best if you believe in white hat SEO techniques.

You can use 2 to 3 keywords in you Meta Description. It's really healthy feature to improve your On page. This one also helpful for the better ranking in Search engine.

Maximum 2 or 3 Keywords we can insert.