"Every time we start a new learning experience, we may be showered by a sleuth of doubts and fears."

sleuth is not the intended word, I think.

Greetings!

Indeed it's not the right word. English is not my first language and I tend to write the book in the evening, after work, which ends up in these mistakes.

Thanks for notifying me, I'm working on a patch that should be out in an hour at most!