Finishing Techniques for Handknitters by Jane Crowfoot
I've seen a LOT of knitting books and this is one of the few that (as a professional knitting teacher) I am happy to recommend. It's not cool and trendy and the patterns are definitely dated, but to learn essential and timeless techniques for giving your knitting a neat and professional finish it is one of the best books out there.
If you're looking for a book for a complete beginner, this might seem too advanced, but use it alongside my book Knitty Gritty: Knitting for the Absolute Beginner and you'll soon be knitting up garments and gifts that anyone would be pleased to wear or receive as a gift. Even after knitting for over 30 years, I still use this book regularly to brush up on essential techniques. Thank you Jane Crowfoot!