This book got me started with Janet a few months ago, and I really think it helped me get past the difficulty I've had in the past starting with Lisp-y languages (Janet is Lisp like only in appearance afaik) but this just clicked. I'm having a lot of fun writing Janet and refer back to the book often.

I do think the macro example that is early in the book is a little overwhelming; if you can get past that everything is far easier. Whats great is that you can leave the author a comment right from the repl, so I did :)