If you want to author content but don't want to create an assignment you can do so in the Item Bank.
Select Item Bank.
Select the Activities tab.
Select the blue plus button.
Enter an Activity Title and select Create.
Find Items already created to add to your Activity by clicking on the gray Find Items button. To create a new item by selecting Create item. Refer to Create an Item for details.
Check the box next to the Items you want to add to the Activity and select add Items.
Select the Back button under the Activities tab.
Finish by clicking Save.