Career Advice About American Express

Big companies have multiple teams across. There will be a team just for the login, a team for backend logic, etc. There are so many teams and microservices and internal jargon all around.

Problem is during team meeting, seniors have more in depth discussion where I'm unable to provide value as good as them.

How do I get familiar with them fast? Or am I focusing on the wrong idea and should just narrow down what I'm working on and just let time do its thing?

Thanks