The book: Byte of Python can be read online. The Author Swaroop C.H. has also graciously allowed us to freely download the PDF File Choose the file which ends in .pdf
The Open Textbook Library has some good books on Python.
If you download a PDF file then you will also need PDF viewing software. Your computer probably already has Adobe Acrobat Reader installed. However, if it doesn’t then follow this video to install it.