The one way to reach this site:
There is no contact form. This site has no server side, so a form would either collect nothing or collect it somewhere I have not built. An email address is honest about what is actually at the other end: one inbox, read by one person.
Mail sent to this address is forwarded to a personal inbox read by an independent developer. No team, no ticket system, no auto reply.
If your message is a correction with a page and a line in it, it is the kind of thing that gets acted on. If it is a question that already has an answer on the page you are reading, it probably will not get a reply, and that is not meant rudely.
Do not send credentials, keys, tokens, or anything else secret. There is no need to, and a forwarded message is not the right place for them.
Almost everything about this site is already written down. Before sending mail: