@itslemon.eth
This is a little more tricky. Especially if either person is not a native speaker of that regions language.
However the same rules apply but are amplified. I try to be very concise and slower when speaking in person, as well as follow up asking if they have questions and even ask them if they understand.
In text, I try to bullet point everything and ask if there are any questions. If no questions, to confirm they understand and to come to me if questions do arise. I never shy down from explaining multiple times as the success of both of us is determined by mutual understanding