For a list of all components and their purpose, please refer to this list of components.
When published, a Table block looks like this:
...
- increase the number of columns or rows, or both. The table will be restructured and no data will be lost.
- decrease the number of columns or rows, or both. Columns will be removed from the right and rows will be removed from the bottom. Any data in those columns and rows will be deleted but data in the remaining columns and rows will remain.
There is no individual 'Save' button for a component. Components are saved when you save the page.