I would suggest watch bangla content with english subtitle. Thats how i learned english when i was young, by watching a lot of pokemon and transformers in english. I should also warn you bangla content of good taste is very hard to find. Here is a link to list of extremely good bangla movie:

https://asianmoviepulse.com/2020/09/20-great-bangladeshi-fil...

Well now here I was going to tell him how he was missing out on Swami Keno Asami or Mithun Chakraborty as Hitler.

I’m currently learning Bangla and there are a few basic apps for iOS that present the letter along with it’s name, pronunciation, and how it is to be written (as in how to piece together the strokes to write the letter). It’s definitely geared towards kids, but the one I’m using is called BorKnow.

Also I’m using a book by Hanne Ruth Thompson called Beginner’s Bengali that does a good job at introducing the script.

Thanks! May I ask what prompted you to learn Bangla?

No problem! My wife’s family is from Bangladesh, so it’s largely due to that. Plus there’s tons of great Bangla poetry and literature I’d love to be able to access eventually.

Unfortunately there’s not that many resources for English speakers, although between family and a great tutor I found on italki.com (and Anki) I’ve been making progress.