New hires need to be onboarded properly - specifically, you need to set expectations quickly. Having a place (like confluence, or other wiki) where these are do

New hires need to be onboarded properly - specifically, you need to set expectations quickly. Having a place (like confluence, or other wiki) where these are documented is a good start (so you can later reference them) - but simply put, you should sit down next to this person, and help them to understand how, but more importantly, WHY you would suggest certain changes. Take the time to build trust with this person. Make sure, at all costs, that you come from a place of helping / teaching - dont come across as an ass.