The book you've been studying (which you forgot to reference in this post) seems to contain a lot of writing errors. To abide by means to comply with or, as you guessed, to obey. "To abide to" is a mistake.
Employee conduct means the ways that employees behave. I have a feeling the author meant to write employer conduct, though there's no way to be sure from your short quotation.
From what I've seen of this book, I suggest you find another one to study.
Write What does "abide" mean?
Student or Learner