How to subscribe (and send responses)
Two ways: Atom feed or Mastodon.
Atom
This blog delivers updates via Atom feeds, a sibling of RSS format. To use it, you need a reader – you can find some suggestions here.
You can send responses via email or using the WebMentions-based interactions form at the end of the every article.
Mastodon
I often announce my blog posts on @ashwinvis@mastodon.acc.sunet.se and @ashwinvis@fediscience.org - where you could follow and even send responses.
For the uninitiated, Mastodon is a decentralized micro blog (like Twitter, but ethical and libré) which can connect with other servers (like e-mail). More accurately, it is one among several software solutions which forms a network called Fediverse. There are various server instances you can join, if you find this interesting.