You've heard of "the bible" - but have you read Bernard's Research Methods? Because, if not, you're missing out on a book that's far more informative, well thought out, approachable, and dependable.
Sure, the opening line of this review might be in jest... actually, no. I teach methods classes in academic and professional settings; review several new methods textbooks each year; and am generally obsessed with trying to improve the methodological rigour of our field. Bernard's Research Methods is, without question, the best book of its kind. It is a comprehensive, well-written, and accurate introduction to a wide range of research methods, both qualitative and quantitative.
Are there things I'd change? Sure. The statistical chapters at the end could use a little more room to breathe, allowing Bernard's smooth way of explaining things to demystify a little more (he does so well on the first half dozen statistical parameters, but we lose this accessibility as the chapter progresses). There are a few places where things are a little dated (e.g., use of computers and digital data) and could use a quick refresher.
But, in terms of being the definitive, absolute go-to methodological source for the vast majority of methods you'll encounter in conducting anthropological research? This is it. Start here, then augment with other classic (e.g., Krippendorff's 'Content Analysis') and important recent (Jensen's 'Doing Real Research' and Gough et al.'s 'Introduction to Systematic Reviews') texts.
But, there is very good reason this is the field's foundational methods text, used by colleagues I respect. Start here.