Should I use Preact instead of React? And are there critical differences?

Question

React

I write in React. But I know that there is Preact and that it is small and fast.
But the question is - how strikingly different is the API and what's under the hood?
Still, React supports Facebook, and so on.
Who used what differences, what do you say?

Answer 1

https://medium.com/@rajaraodv/using-preact-instead...
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