A word stem is the root of a word from which other forms derive. Google treats variations with the same stem (article, articles, the article) as synonyms for ranking purposes.
A word stem refers to the base form of a word from which other forms derive. For example: "calculate" is the stem, and "calculates", "calculating", "calculator" are variations. Google uses stemming to understand that variations of a word are related and relevant to the same search intent. If you rank for "SEO calculator", you will also rank for "SEO calculators", "calculate SEO", etc., without optimizing each variation separately.
Google is smart with variations: you do not need to create separate pages for each one. A page optimized for the main stem will also rank for its variations — saving effort.
Source: Moz — Keyword StemKeyword research is the process of identifying the words and phrases your target audience searches for on Google, so you can create content that answers exactly those searches.
Long-tail keywords are longer, specific search phrases (3+ words) that have lower volume but clearer intent and less competition than short, generic terms.
The SERP is the results page Google displays after a search, which includes organic results, paid ads, featured snippets, the Local Pack and other special formats.
Search intent is the purpose behind a Google search — why the user is searching that term: to learn, to compare, to buy or to navigate to a specific site.
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