The easiest and simplest way to get in touch with me is to reply to any of the emails you've received from me.
My email is firstname.lastname@example.org.
I also invite you to contact me with the form, below.
P.S. Course emails come from email@example.com.
If you want to make sure you see all those messages, it might be a good idea to reply to at least one email with a simple message like "got it!" or "Looks great!" This interaction will tell your inbox that you want to hear more from me.
You can also leave a comment on the course you're working on.