There is no one definitive answer to this question. It depends on your blog’s focus and what type of keywords you are Targeting. However, generally speaking, most blogs need around 100-1,000 keywords to be effective. Keep in mind that not all of these will be appropriate for your blog, so it’s important to use a keyword research tool to help identify the most relevant terms.
Once you have a list of Targeted keywords, it’s important to include them in your blog’s title, meta description, and content. Additionally, it can be helpful to include keyword meta tags on your website and in the content of your posts.