hugo-theme-hello-friend/layouts/partials/head.html

<meta http-equiv="content-type" content="text/html; charset=utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1">
<meta name="description" content="{{ if .IsHome }}{{ .Site.Params.Subtitle }}{{ else }}{{ .Summary | plainify }}{{ end }}"/>
<meta name="keywords" content="{{ .Site.Params.keywords }}"/>
<meta name="robots" content="noodp"/>
<link rel="canonical" href="{{ .Permalink }}" />

<!-- Theme CSS -->
<link rel="stylesheet" href="{{ $.Site.BaseURL }}/assets/style.css">

<!-- Custom CSS to override theme properties (/static/style.css) -->
<link rel="stylesheet" href="{{ $.Site.BaseURL }}/style.css">

<!-- Icons -->
<link rel="apple-touch-icon-precomposed" sizes="144x144" href="{{ $.Site.BaseURL }}/img/apple-touch-icon-144-precomposed.png">
<link rel="shortcut icon" href="{{ $.Site.BaseURL }}/img/favicon.png">

<!-- Twitter Card -->
<meta name="twitter:card" content="summary" />
<meta name="twitter:title" content="{{ if .IsHome }}{{ $.Site.Title }} — {{ $.Site.Params.Subtitle }}{{ else }}{{ .Title }} :: {{ $.Site.Title }} — {{ $.Site.Params.Subtitle }}{{ end }}" />
<meta name="twitter:description" content="{{ if .IsHome }}{{ $.Site.Params.tagline }}{{ else }}{{ .Summary | plainify }}{{ end }}" />
<meta name="twitter:site" content="{{ .Site.BaseURL }}" />
<meta name="twitter:creator" content="{{ .Params.Author }}" />
<meta name="twitter:image" content="{{ with .Params.Cover }}{{ $.Site.BaseURL }}img/post/{{ . }}{{ else }}{{ $.Site.BaseURL }}img/default.jpg{{ end }}">

<!-- OG data -->
<meta property="og:locale" content="{{ $.Site.Language.Lang }}" />
<meta property="og:type" content="{{ if .IsPage }}article{{ else }}website{{ end }}" />
<meta property="og:title" content="{{ if .IsHome }}{{ $.Site.Title }} — {{ $.Site.Params.Subtitle }}{{ else }}{{ .Title }} :: {{ $.Site.Title }} — {{ $.Site.Params.Subtitle }}{{ end }}">
<meta property="og:description" content="{{ if .IsHome }}{{ $.Site.Params.tagline }}{{ else }}{{ .Summary | plainify }}{{ end }}" />
<meta property="og:url" content="{{ .Permalink }}" />
<meta property="og:site_name" content="{{ .Title }}" />
<meta property="og:image" content="{{ with .Params.Cover }}{{ $.Site.BaseURL }}img/post/{{ . }}{{ else }}{{ $.Site.BaseURL }}img/default.jpg{{ end }}">
<meta property="og:image:width" content="2048">
<meta property="og:image:height" content="1024">
{{ range .Params.categories }}<meta property="article:section" content="{{ . }}" />{{ end }}
{{ if isset .Params "date" }}<meta property="article:published_time" content="{{ time .Date }}" />{{ end }}

<!-- RSS -->
{{ if .RSSLink }}
<link href="{{ .Site.RSSLink }}" rel="alternate" type="application/rss+xml" title="{{ .Site.Title }}" />
{{ end }}

<!-- JSON Feed -->
{{ if .OutputFormats.Get "json" }}
<link href="{{ if .OutputFormats.Get "json" }}{{ .Site.BaseURL }}feed.json{{ end }}" rel="alternate" type="application/json" title="{{ .Site.Title }}" />
{{ end }}