The easiest way to contact me privatly is to DM me on Twitter. I'm also active on Mastodon on the social server. If you're replying to or reacting on a specific blogpost, please include which one as well!
Aditionally, you can also provide public feedback by using the comment section at the bottom of each blogpost. If you just want to leave a message on the website in general, you can use the guestbook comment section. You need to have a Github account to login, but since this blog is really developer centric I assume that won't be an issue.
If you found a bug in the website, a typo in a blogpost, or a content-related problem somewhere, please do let me know! Contact me privately, create an issue on the public repository. Additionally, if you're able to create a pull request containing the fix, that would even be better!