We can use Content type in SharePoint list, library, event receiver, workflow and page layout.
Steps for creating a Content TypeStep1 Go to Site settings -> click Site content type under Web Designer Galleries .
Step2
Click on New - > the below screen will appears.
Step3
Now you can add the Name and Description of the Content type and you have to choose parent content type. Next you have to choose the group, in which group you want to add your content type then click on Ok.
Step4
Once it's created the created content type screen looks like this.
Step5
Now you can create site column under your content type. You can use existing site columns or create a new site columns .
Step6
Now, I have created three new columns under Content type or you can use existing site columns
Step7
Now, I have created a list and I will use the same content type in that list.
Go to list -> List Settings - > Advanced settings under General settings menu.
Step8
Select Allow management of content type ="Yes " then click on Ok .
Step9
Then go to content type section in your list settings page and click on add from existing site content types .
Step10
Choose your content type and click on Ok button.
Step11
Then go to your list and add an item in your list . Once it is added then edit the item and see if your content type is visible here .
Step12
If I choose MyContentType then I will see one more page to add items.
Step13
Finally, the ListView looks like this.
These are the steps to create a content type in List . You can create the same for Library.