Before you can use Oracle SQL Developer or MySQL Workbench, you need to connect to a database server. Both tools support various types of connections, such as JDBC, ODBC, SSH, or cloud services.

If you want to install Oracle SQL Developer on your Windows computer for free, check if you meet the requirements and then go through the instructions mentioned here.

To install Oracle Database on Windows for free, download Oracle database files, install Oracle, and then set up Oracle using this guide, ...

In this repo, there are lecture notes of Oracle DB and SQL Developer tools.