If you use the same block structure repeatedly on your site, consider creating a pattern. This saves time because you won’t need to rebuild the block each time.
For example, on this site I use callout boxes for Tip, Note, and Try It. After creating the first callout, I saved it as an unsynced pattern. This lets me reuse the same formatting while customizing the text for each instance.
Keep in mind that because the pattern is unsynced, any future formatting changes must be applied manually to each instance.