First, Install OpenBangla for your distro [following the official guide.](https://openbangla.github.io/install/) (OpenBanlga include avro and many more feature.)
Next, configure the input method for your Window Manager according to the guide above. After you do that, you can now change input method using `s+SPACE` So now you can have a workflow.
\- Go to emacs
\- Open a file and type some bangla texts.
\- If you need to type commands, do `s+SPACE` to move back to English.
Its fairly obvious but I thought it might be helpful for some beginners who searched for similar feature, like me. And also, its not nearly as seamless as `M-x set-input-method bengali-itrans` which automatically handles all of these for you and gives you an amazing writing experience. Sadly, it does not yet provide avro-style input-method and the existing `itrans,probhat` are really unorthodox input method that very few uses and hard to master. I hope someday I will have enough knowledge to contribute that.