Object Management
Salesforce lets you customize your object model with features like custom fields, page layouts, and validation rules. Most objects are available from the Object Manager in Setup.
Standard Objects and Custom Objects
A standard object, such as Account or Contact, comes out of the box with your Salesforce organization. A custom object is an object that you or another administrator created.
From Setup, at the top of the page, select Object Manager. Select one of the objects in the list, and then select a specific customization from the left pane.
For example, to add a custom field to the Account object, select Object Manager from the top of the Setup page. Next, select Account, and then Fields & Relationships. Select New.
NOTE If you’ve renamed any objects or fields, the Object Manager uses their assigned custom names.
Other Standard Objects
Some standard objects aren’t housed in the Object Manager. Standard objects with more specific purposes and customizations can be found in Setup using the Quick Find box.
From Setup, enter the object name in the Quick Find box, then select the customization.
Custom Objects
You can also create custom objects from the Object Manager. From Setup, at the top of the page, select Object Manager. Then select New Object.
External Objects
An external object is similar to custom objects, except that it maps to data that’s stored outside your Salesforce organization.
From Setup, enter External Objects in the Quick Find box, then select External Objects. Next, click one of the external objects in the list. Then scroll to the section for the specific customization.
For example, to add a custom field to the Orders external object, enter External Objects in the Quick Find box, then select External Objects. Click Orders, and then scroll to Custom Fields and Relationships.
This blog is very useful to learn about the object management in Salesforce lightning.
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