The levels A1, A2, B1,… of German, as with English, are such that A1 and A2 are the elementary, beginner levels, while B1 is the level that shows you are more proactive in the language. After reaching level B1, you will be able to understand and grasp the content of conversations about familiar matters in daily life, especially content related to work, transport, and school. However, the person you are communicating with needs to speak correctly and in standard language.