Using only width or height attribute for <img> element to let the browser conserve the natural width and height ratio of the image.
Using bootstrap to mark different HTML elements with specific classes provided by bootstrap to style those HTML elements with CSS. The website https://getbootstrap.com/ maintains a good documentation. A user can copy code snippets from this website and experiment on his own.
https://lipsum.com/ for generating dummy texts.
The author's personal website can be found on www.johnelder.org
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