Establish a repository and be methodical in how you organize your work.
Its important to have a running tab of folders that document strategic initiaves in order to then easily onboard teams and stakeholders across the business. I often times have recording, decks, sales materials, and everything that touches me organized in a proper manner so when someone does onboard, I can give them access to the folder, which allows them to onboard quickly.
I also like to build out frameworks. In my recent job, I built out something called a Value Framework. This contains all of our messaging but also guides a reader through how we differentiate, segment, and align ourselves with the buyer and market. Its meant as an internal/enablement tool but often times have found it super easy for those to use to onboard.