For downloading , the official and most reliable source is Oracle’s Technology Network (OTN) .
Select "Desktop class" if you are installing on a laptop or PC for learning; select "Server class" for production environments. download oracle 19c for windows
Once the software is installed and the database created: For downloading , the official and most reliable
Oracle will scan your system. If everything is green, click "Install." Post-Installation Verification click "Install." Post-Installation Verification