Oracle often provides "Developer VMs" (Virtual Machines) that come pre-installed and pre-configured with the full stack.
If you are looking for a way to learn Oracle Forms and Reports without the headache of a manual 11g install, consider these safer paths: oracle 11g forms and reports software 13 repack
Below is an overview of what this software stack entails, why repacks exist, and the risks you should consider before installing one. Understanding the Stack: Oracle Forms & Reports 11g why repacks exist