If a text is short enough, we can usually use the <quote> or <q> tags.

However, sometimes we need to quote longer pieces of text.

So for longer lines of code, we use the <blockquote> tag, which is, I think, self explanatory. Most themes will auto-format blockquotes so that they will look nice, and that they will stand out from the rest of the text. This means your readers won’t mistake blockquoted text for something you wrote yourself.

It’s good to keep blockquotes to a manageable level. If your entire post consists of material quoted word for word elsewhere, then you might be branded a plagiarist (if you don’t have adequate citation). You might also get penalized by the search engines for duplicate content.