Understanding the process, tools, and little details of local development for the team and product.
Understanding who does what on the team, and how to deal with each personality, role, and processes.
1) the ability to create content, and have that content consumed, that lets new folks come up to speed. Reading and comprehending is a lot harder for a lot of people than we like to admit.
2) Letting people know that failure and experimentation as part of learning is ok and expected. It’s generally easier for new folks to sit and do nothing than to try, fail, and ask for clarification and help. Paving the path for the latter both culturally and technologically is extremely difficult at scale.