Create new page
- You can create a new page by using "Add content" button on the "Content list" page /node/add.
Create a new block
- You can create a new block on the "Custom block library" page /admin/structure/block/block-content. See article about drupal 8 blocks
Create new view
- You can add new view as a block or a page by using "Add view" button on the Views page /admin/structure/views. See article about drupal 8 view