even the New version of brewing lager beer?
A good book! I have it in my library. Highly recommended.
Yes things have changed. We get much better ingredients today than was available 20 or 30 years ago.
The basics are still the basics, however. Use good malt, yeast, hops, and water. Pay attention to sanitation. And temperature control is paramount in producing a great lager.
There is a huge amount of info online today that was unavailable in my earlier brewing career. Even outside of AHA.