There is no standardized or specific number of keywords that a webpage should have in SEO. However, it is recommended to focus on a specific set of relevant and high-traffic keywords that align with your content and target audience. Overstuffing your webpage with too many keywords can result in poor user experience and harm your SEO efforts by being marked as spammy or low-quality content by search engines. It is also important to use your keywords naturally and strategically throughout your webpage, including in the title tag, meta description, header tags, body content, and image ALT text to improve your page's relevancy and ranking.