How to use the AVR Assembler (AVRASM2) for complex projects

I like to share how I use AVRASM2 for complex AVR projects.
This is about advanced features of AVRASM2, like macros.
The aim is well structured, easy to maintain, efficient and re-usable 
code.

http://web222.webclient5.de/doc/advavrasm2/AdvancedUseAVRASM2_en_20180120.pdf
(version 0.3 from 2018-01-20, PDF, 590 KB)

This is not about the AVR instruction set or how do do algorithms in 
assembler. For those there is plenty of good material available on the 
web.