One of the easiest and most beneficial things you can do for SEO is make sure your title tags greatly match the keywords you are going for and the page that it is representing.
While the META description tag is supposedly outdated and not worth much value anymore it can still help on the CTR as it does show up as the description for a page in the SERPs.
The META keywords tag was once of high value in the whole scheme of SEO, but since the rise of Google and the reliability of link structures META keyword tags have lost their value.
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