A2.1 is the first half of the A2 level. It is where you move past "I am from Germany" to "I grew up in Berlin, but I moved to Munich five years ago for work." You begin to narrate past events, express opinions, and understand standard speech on familiar matters. The is specifically engineered to facilitate this leap.
Carrying a heavy 250+ page textbook is impractical. A PDF allows you to study on your tablet, laptop, or even your smartphone during your commute.
The Menschen series is built on the principle that people learn best through "storytelling" and visual cues. Unlike traditional, grammar-heavy textbooks, Menschen prioritizes and emotional engagement.