If I have a client that wants to invest in Bitcoin or any other cryptocurrencies, but he/she does not have any actue ideas on how the Bitcoin ecosystem works. How do I convince such person?
You never convince anyone to invest in Bitcoin. If there is a knowledge gap, you can supply them with basic knowledge that can help fill that gap and enable them make an informed decision themselves.
what are the smartest ideas and informations I need to share to such person inorder to align with their vision?
You can search for beginners articles which introduces one to Bitcoin or help them create a account on the forum and find the necessary information themselves.