Theres lots of examples of easy keywords. Page one competition is a good place to start but I would categorize an easy keyword as one that nobody else is doing any seo for. Either because it has little to no profit potential to marketers or is a specific business exclusively for local seo.
Over optimising will get you flagged as spam by Google and they have clamped down on it in the last three years. If you only have one keyword you will have to diversify it as much as possible and not go overboard on an emd/H1H2 tags/title tags and keyword stuffing.
