This is the 13117th most frequent German word.
anfangen
To begin or to start.
The word 'anfangen' is used here to denote the beginning of an activity, specifically the act of starting to read a new book.
Ich fange heute ein neues Buch an.
I am starting a new book today.
The word 'anfangen' is used here in connection to a time inquiry, asking about the start point of an activity, which is beginning work.
Wann fängst du mit der Arbeit an?
When do you start with your work?
Here, 'anfangen' refers to the challenge of resuming an activity after it was interrupted or paused.