Are there SEO-related features?

Hello, these features are specific to the template you use. You can generally find these tags in the template's head.html file. Take for example, the tags in the Diary template's head.html file:

<meta name="description" content="{{> description}}">
<meta name="twitter:card" content="summary">
<meta property="og:type" content="website">
<meta name="twitter:title" property="og:title" itemprop="title name" content="{{> title}}">
<meta name="twitter:description" property="og:description" itemprop="description" content="{{> description}}">

Blot doesn't set the canonical link for each post/page, although it might be a good idea – I haven't yet done the research into whether it is necessary. However, if you would like to adjust these for your specific site, please fork a copy of one of the built-in templates and make your changes as needed.

Please let me know if you have any questions about this or anything else!

Professional SEO here. Canonicals are really only necessary when there are multiple URLs of essentially the same content. Things like sort order or filtered result sets usually would benefit from having a canonical pointing to the default version of the page.

In the absence of a canonical, search engines assume the URL is canonicalized to itself.