Numpy is a widely used Python library among data scientists.
For an excellent introduction, the official documentation offers everything you need to know as a beginner.
Visit Numpy’s Beginner’s Guide to get started. https://numpy.org/doc/stable/user/absolute_beginners.html
It’s not essential to memorize the content, but do get comfortable with the basics.
Always feel free to consult the official documentation anytime you need clarification or help with something.