Hey @diaaesam123,
No worries. You can always check out the tutorials for each of the packages that are used in the course. For instance, the course extensively uses NumPy. You can find the tutorials for NumPy here. You can take a look at some of these, and once you get the basic idea, you can just take a look at the documentation whenever you encounter a new function being used from the library.
The same holds true for other packages. You will find that all the packages that the specialization uses, all well-developed packages and provide an extensive documentation and tutorials for the beginners. Let us know if this helps.
Cheers,
Elemento