Subscribing to the RSS / ATOM feed
ATOM is a standard for subscribing to web content. (RSS is its predecessor.)
Think a Youtube account that you use to subscribe to Youtube channels. Each ATOM feed is like a channel, and your “RSS reader” of choice is your subscription feed. Although, unlike on Youtube, you have to manually add the URL into your reader to subscribe.
The feed to this blog is here: https://kisaragi-hiu.com/feeds/all.atom.xml
 Firefox used to display a summary of the feed and a button to add it to some readers when visiting a feed; however, it has been removed.