Step 1: related.html

Add a related articles page by creating a new file named related.html in the layouts/partials folder, with the following code.

layouts/partials/related.html
{{ $related := first 5 (where (where .Site.Pages ".Params.tags" "intersect" .Params.tags) "Permalink" "!=" .Permalink) }}
{{ with $related }}
    <h3 class="see-also">{{- i18n "related" -}}</h3>
  <div class="related">
    <ul>
      {{ range . }}
        <li>
          <a href="{{ .RelPermalink }}" target="_blank">{{ .Title }}</a> <span class="related-date">（{{ .Date | time.Format "2006-01-02" }}）</span>
        </li>
      {{ end }}
    </ul>
  </div>
{{ end }}

<style>
.post-footer h3 {
  margin: 1.2em 0 1.2em;
}

.post-footer .related {
  padding-bottom: 1.5rem;
}

.post-footer .related ul  {
    padding-inline-start: 20px;
}

.post-footer .related ul li{
    list-style-type: square;
    margin-bottom: 0.5rem;
}

.post-footer .related ul li a{
    text-decoration: underline;
    transition: color 0.3s ease-in-out, text-decoration-color 0.3s ease-in-out;
    text-decoration-thickness: 1px;
}

.post-footer .related-date{
    font-size: 0.8em;
    font-style: italic;
}

.post-footer .related a:hover {
  box-shadow: 0 1px;
  text-decoration: none;
  color: #ff5722;
  text-decoration-color: #ff5722;
  text-decoration-thickness: 2px;
}
</style>

Step 2: single.html

Adjust the single.html file in the layouts/_default folder by adding code under the <footer class="post-footer"> tag.

<footer class="post-footer">
  {{- if (.Param "ShowRelatedContent") }}
    {{- partial "related.html" . }}
  {{- end }}
  {{- $tags := .Language.Params.Taxonomies.tag | default "tags" }}
  <ul class="post-tags">
    {{- range ($.GetTerms $tags) }}
    <li><a href="{{ .Permalink }}">{{ .LinkTitle }}</a></li>
    {{- end }}
  </ul>
  {{- if (.Param "ShowPostNavLinks") }}
  {{- partial "post_nav_links.html" . }}
  {{- end }}
  {{- if (and site.Params.ShowShareButtons (ne .Params.disableShare true)) }}
  {{- partial "share_icons.html" . -}}
  {{- end }}
</footer>

Step 3: Language translation

i18n/en.yaml
- id: related
  translation: "Related posts"
i18n/en.yaml
- id: related
  translation: "相关文章"

Step 4: Adjust the configuration file

Adjust the site configuration file (hugo.yaml) by adding showRelatedContent: true under the params section.

languages:
  en: 
    languageCode: en-us
    languageName: "English"
    params:
      author: Rickey
      showRelatedContent: true
      social: true
  zh: 
    languageCode: zh-cn
    languageName: "简体中文"
    params:
      author: 龚东海
      showRelatedContent: true
      social: true