Code Complete (https://en.wikipedia.org/wiki/Code_Complete https://en.wikipedia.org/wiki/Code_Complete). I hear that it's probably not as relevant these days,

Code Complete (https://en.wikipedia.org/wiki/Code_Complete https://en.wikipedia.org/wiki/Code_Complete). I hear that it's probably not as relevant these days, since it's been nearly 20 years since the 2nd edition was released, but the attitude towards professionalism it instilled in me was invaluable, and the fact that all the recommendations were backed up by studies made it so that I could back up my decisions with facts.