I worked at a MegaCorp, and we required all new hires to (1) teach the next hire our architecture, core user journeys, etc and (2) the new hire had to present t

I worked at a MegaCorp, and we required all new hires to (1) teach the next hire our architecture, core user journeys, etc and (2) the new hire had to present their learnings to the team, standing with their (quiet) teacher. Both of these steps were crucial. The presentation serves a ton of purposes, it ensures both the student and the teacher learn the material enough to present with a whiteboard, and the team can catch any mistakes or misunderstandings at a time when they'd have the most sympathy towards ignorance. It also is a good low-stakes way to force someone to present and get used to the team and talk to everyone in a formal setting. We also always ordered pizza + beer after too make it a "fun" (or at least casual) environment that wasn't too serious.