+1 for that book but it's a bit rough for a start I think. I'd try headspace, calm or any of the free guided meditations on YouTube for a bit before diving into that book. And yes the book reads quite spiritual despite the author being also a neurologist I think so it might not be for everyone.
Depending on your preferences you may want to ignore some of the more religious/spiritual parts in it.
Either way, it has had a big, positive, and lasting influence on my life (even though I haven’t been meditating much lately anymore).
[0]: https://a.co/d/08L5nc8t