One of the great advantages that Bootstrap brings to Layout Builder in Drupal is all the Bootstrap goodness like layouts and styles (watch this video: https://www.youtube.com/watch?v=Ky8U5AdvDX4).
Layout Builder Blocks brings the same styling capabilities to the block level (where the content on a landing page “lives”) and it’s really easy to install and configure.
This is a “must add” module if you’re using Layout Builder in Drupal.
We have an full-length course on Drupal 10 Layout Builder at OSTraining – https://ostraining.com/courses/layout-builder-for-the-ambitious-site-builder/