This framework (Talk & Observe) captures the two most important ways you’ll learn as a new engineer.
Talk with various people on the team to learn what they do and what you need to know.
To add more structure to this conversation, follow the advice from Boz (CTO at Meta): Career Cold Start Algorithm
Ask people’s priorities and what concerns they have.
Observe how others operate at the company by studying the artifacts of their work. As engineers, we naturally have tons of markers to our progress.