Professional material that teaches React?

Dear developers of Reddit,

I have been working with React for almost a year now, and I feel like I am not using react to its full potential. I learned react from a few udemy courses from Colt Steele and a few others, but they only seem to touch the beginner level. Do you have any "expert" level resources or courses I can learn from? If you are already employed in a web development company, did your company provide the training?

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Thank You