Here are some resources and ideas for enhancing the WordPress theme Twenty Tweny.
Twentig Plugin
https://wordpress.org/plugins/twentig/
Choosing a Page Template for Twenty Twenty
https://www.youtube.com/watch?v=J-AhjsK1hSs
Twentig Plugin Customization by Fran Salas (video in Spanish)
https://www.youtube.com/watch?v=F8aySY9shtc
The first 4 minutes shows how to use Twentig to enhance Twenty Twenty theme with a transparent header.
Gutenberg Hub
https://gutenberghub.com/
Add Custom CSS
https://webdesign.tutsplus.com/tutorials/how-to-add-custom-css-to-your-wordpress-site–cms-34367
Add Custom CSS (on WP Beginner)
https://www.wpbeginner.com/plugins/how-to-easily-add-custom-css-to-your-wordpress-site/
Twenty Twenty Theme — An Introduction
https://kinsta.com/blog/twenty-twenty-theme/