Quick Question, - Publishing/Editing Gutenberge Post?

I wanted to get a clear understanding of the "Post Editor" feature, specifically the part where it says, "Publish content with the powerful Gutenberg post editor to optimize content as you want." I’m excited about the possibilities but would love some additional insight into what this means from a functionality perspective.

Here are a few specific questions I have:

Content Optimization: When it says "optimize content," is this referring primarily to layout and visual design, or are there built-in SEO or performance tools in the editor to enhance content optimization?

Customization Capabilities: Could you elaborate on how customizable the Gutenberg blocks are? I’m eager to learn how I can leverage these tools to the fullest, so any information you can provide would be greatly appreciated!