Oracle Database 18c (18.3) is available for download for windows platform since August 22, 2018. If you are new to Oracle or if you are a developer and need a database to play with, you can install an Oracle database quickly on your laptop with a few clicks. You can install the software and create the database instantly using the installer to create the starter database.
After the software install, the database creation is only 3 clicks using the Database Configuration Assistant! The Oracle defaults are OK!