Reddit reviews Information Development: Managing Your Documentation Projects, Portfolio, and People

This is a copy and paste from a few months ago. There isn't really a "bible," so to speak, because the field is so varied. But this list should get you started. There are also some technical writing textbooks on Amazon that might be useful.

• The Chicago Manual of Style, 17th Edition - the classic reference. This covers pretty much everything you ever wanted to know about grammar and usage, including things you didn't know that you didn't know.
  
  
• The Chicago Guide to Grammar, Usage, and Punctuation - this is an expanded version of chapter 5 of the CMoS mentioned above.
  
  
• The Microsoft Manual of Style, 4th Edition - if you write for Windows-based software, this is the book you need.
  
  If you're looking for more mechanical things like document structure and organization, I'd recommend the following:
  
  
• Information Development - look for this one used, it's been out of print for awhile. Good information on managing documentation projects. I'm a bit of a broken record on this subject, but a LOT of a technical writer's job is managing projects.
  
  
• Handbook of Technical Writing (this is apparently a textbook now...?) - just what it says on the tin. Good overview of various topics related to tech writing.
  
  
• Developing Quality Technical Information - another overview of various topics related to tech writing. This isn't a "read cover to cover" kind of book, but more of a "open to a random location and just start reading" kind of book.
  
  
• The Non-Designer's Design Book - one thing that tech writers have to think about, or at least should be thinking about, is document design. This is the best book I've found on that subject, bar none. The principles taught in this book guide the layout and design of pretty much every document I've created in the past 9 years.
  
  
• The Insider's Guide to Technical Writing - a good overview of some basic technical writing topics.
  
  
• Every Page is Page One - I've been trying to move more towards the concepts covered in this book as I redo and update the current mess I inherited from the previous tech writer.