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2) Create a unique page title and a meta description for each page
The page title is the URL, so keeping it to the point and between 14-30 characters is ideal for Google’s crawlers.
Now the meta description comes from the content that is in the page or the first few lines from a blog post, you can “hack” it by using a SEO plugin such as RankMath or Yoast among others to display certain text with better phrasing or better describing your content.
As far a size goes, you need to keep in mind that google’s ad manager, has a total capacity of 131 characters, use that as an indicator of how long your meta description should be.