Drupal 8.x

Actually, I have a site with vanilla Drupal 8 with latest version. And I have installed Redis in Ubuntu server and also integrated Redis with my Drupal 8 site successfully.

And Now I am able to store all cache in Redis not in default database cache table, after adding below lines in my settings.php file.

Building commercial websites is getting worse since Drupal starts to use Symphony Framework.
Why?
f.e.:
Drupal 7 was released 5th January 2011, Commerce 7.0 war available 23th August 2011.
Drupal 7 will reach EOL November 2022
With D7 Vendor Extended Support (D7ES) maybe the end will be 2025
A commercial website was usable for 10 years. Maybe longer with D7ES

Short version. I messed up Drupal (500 error). I am trying to reinstall but keep getting an error that it is already installed. I have deleted the public files and the database. What did I miss?

I am using the Olivero theme on my Drupal 9 site and building a map with the https://www.drupal.org/project/geolocation module.

I want to create a Views to display these two displays of the same nodes :

 - one display which is a map (displayed in the "hero" region)
 - another display (e.g. a list of teasers) which is displayed in the "content" region.

I want them both displayed on the same page and have them share the same filters. If I filter the map, it must filter the nodes.