What package or commands are needed to format section titles(subtitles) to the left of text blocks?

Question

I am new to LaTeX and have searched around for templates and examples, but have not found much. I looked at fancyheaders package but was unable to ascertain whether the setup was possible in a simple and straightforward manner. I searched left side headers, and headers overtop margins and google images produced very few to no results for this style.

header footer

DG' · Answer

titlesec allows you to redefine the section commands. You can use titleformat with the option leftmargin, to move the heading in the, well, left margin:
documentclass{article}
usepackage[showframe]{geometry}

usepackage{blindtext}
usepackage{titlesec}

titleformat{section}[leftmargin]{normalfontbfseries}{}{0pt}{}
titlespacing*{section}{2.5cm}{*2.5}{0.5cm}

titleformat{subsection}[leftmargin]{normalfont}{}{0pt}{}
titlespacing*{subsection}{2.5cm}{*2.5}{0.5cm}

begin{document}
  blinddocument
end{document}

What package or commands are needed to format section titles(subtitles) to the left of text blocks?

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