How do I contribute to the Bitcoin ecosystem as a developer?

Hello everyone, this is my first post!

I have been interested in bitcoin for the past 3 years and have read books like “The Bitcoin Standard” and “Mastering Bitcoin”, but have never really gotten involved into its development.

Now that I have some more experience with coding and have a good (although surely not complete) technical understanding of how bitcoin works, I would like to get involved and be proactive.

Can anyone with some experience recommend useful resources/technologies to prioritise in order to become a contributor? Lastly, do you know of any company that offers training (or programs) for bitcoin developers?

Thank you for all your answers in advance, and I hope this post could be a mini guide for people in a position similar to mine.

Personal note: a few projects I have looked into use rust (bdk, fedimint.. ) and C++ (bitcoin core) so I was looking to learn those.