The basics are you first pick a keyword or subject through keyword research.
Next you go to WikiPedia and search on the keyword/subject
Next pick out all the underlined words or phrases in the WikiPedia article.
Once you have a list of terms from WikiPedia, you can then go about writing the article and apply those terms throughout.
The advantage of doing content this way is the fact that many words and phrases aren't just synonyms of your keyword or phrase, but natural text that Google seems to love.