I have created a custom block, but there is no option to add content or any body part.
How do I add content to a block?
I have created a custom block, but there is no option to add content or any body part.
How do I add content to a block?
It depends on block type. If you create a block in default type "Basic block" then you'll have one "Body" field for entering the content. But with Drupal 8 you also have ability to create custom block types. With custom block types (and your one is a custom one) you are responsible for adding body fields. So you don't see content field simply because that block type doesn't have one. You didn't add it.
Go to Structure -> Block layout -> Custom block library (tab) -> Types (tab)
... and on that page you can see all block types. You can manage them, add/remove fields etc.