Which version to work on to contribute

[brunoCCOS]

Hi im pretty new to contributing to open source at all, so im trying to fix a very small thing, but as i follow contributing start guide and launch breeze the airflow version that i get in the env is the 3.0.0 while the current live is 2.10.3. More then this is the fact that apparently the operator which is causing problems in 2.10.3 ( PythonOperator ) is not in version 3.0.0. So my question is, i should work on the 2.10.3 version of the airflow ? and if yes, how i do so ? I just fork from the tag 2.10.3 instead of main ? Please some help