As a minimum, these are the essential meta tags your Shopify store should have.

{%- liquid
assign og_title = page_title | default: shop.name
assign og_url = canonical_url | default: shop.url
assign og_type = 'website'
assign og_description = page_description | default: shop.description | default: shop.name

if request.page_type == 'product'
assign og_type = 'product'
elsif request.page_type == 'article'
assign og_type = 'article'
elsif request.page_type == 'collection'
assign og_type = 'product.group'
elsif request.page_type == 'password'
assign og_url = shop.url
endif
%}

<meta property="og:site_name" content="{{ shop.name }}">
<meta property="og:url" content="{{ og_url }}">
<meta property="og:title" content="{{ og_title | escape }}">
<meta property="og:type" content="{{ og_type }}">
<meta property="og:description" content="{{ og_description | escape }}">

{%- if page_image -%}
<meta property="og:image" content="http:{{ page_image | img_url: 'master' }}">
<meta property="og:image:secure_url" content="https:{{ page_image | img_url: 'master' }}">
<meta property="og:image:width" content="{{ page_image.width }}">
<meta property="og:image:height" content="{{ page_image.height }}">
{%- endif -%}

{%- if request.page_type == 'product' -%}
<meta property="og:price:amount" content="{{ product.price | money_without_currency | strip_html }}">
<meta property="og:price:currency" content="{{ cart.currency.iso_code }}">
{%- endif -%}

{%- if settings.social_twitter_link != blank -%}
<meta name="twitter:site" content="{{ settings.social_twitter_link | split: 'twitter.com/' | last | prepend: '@' }}">
{%- endif -%}
<meta name="twitter:card" content="summary_large_image">
<meta name="twitter:title" content="{{ og_title | escape }}">
<meta name="twitter:description" content="{{ og_description | escape }}">
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