Ethic use BuddyPress and bbPress plugin to help you create your forum easily. Before creating this page, these plugins must be installed. It is recommended for you to refer to BuddyPress Documentation and bbPress Documentation
How to create:
Step 1: - Go to Plugins --> Add new and click Install now
Step 2: - Go to Settings --> Permalinks and choose another type instead of Default structure.
Step 3: - Navigate to Settings --> BuddyPress/Forums and configure other settings.
Step 3: - Create forums. You can create site forum or group forum. Please back to documentations of BuddyPress and BBPress for more instructions
Step 4: - Navigate to Pages --> Add new, create new page and select bbPress - Forum (Index) as its template. Here you can create different pages by using templates whose prefix is bbPress -
Step 5: - Add your forum to menu