My boss gave me 30 days (not working days) to learn c++ to transfer to Data Science team. What is the best approach to learn as much as possible?

[Zayn]

Hi all, I'd like to ask you a question that's in my head ... I'd like to know my boss gave me 30 days (not working days) to learn c++ to transfer to data science team. what is the best approach to learn as much as possible? Thank you very much for kindly giving me your help as soon as possible.