Since each of any block has its own wrapper you are free to edit or move each block independently of other blocks, and individual blocks usually come with their own formatting or styling settings for even greater control over layout and function.
The following steps will show the several available ways to add a block and choose the block type you need.
Click on the plus icon at the left of any empty block.
Click on the plus icon at the top left corner of the editor toolbar.
Hit the Enter or Return key from a selected block to create a new block below it.
Click on the plus icon at the top or bottom center of an existing block to add a block above or bottom it.
Click on the three dots just above a selected block and choose to add a block above or below the current block.
Note that the default block type is a paragraph which you’ll use for regular text or content on your site although you can choose a different block type by clicking on the plus icon as explained above. You can also search blocks by typing a forward slash followed by the block name for instance,
You can also drag blocks around by clicking and holding the six-dot-grid icon near the top-left corner of each block, or use the up and down arrows to bump a block one spot in the direction you want.