Learning the language is vital here. Most things are not in english but only in german. Every official letter you receive will be in german.

Looking for an apartment? Better speak german with the landlord.

You may get through for a few years in an international city like Hamburg, Berlin, München if you find a job at an international company. But long term? Learn german or you will suffer.

> Every official letter you receive will be in german.

Is that different in any other country?

Would you expect to be able to recieve them in spanish, while living in France?

There is also https://de.wikipedia.org/wiki/Leichte_Sprache , which many official websites provide, seems even to be mandatory for some services to have that option on offer.