Upgrading Drupal

have been sitting before Christmas trying to figure out how to upgrade the page from D 8.9.11 to 9.1.0. but have not come any particular ways with project. have also tried me to follow "Upgrading from Drupal 8 to Drupal 9 (or higher)" without getting any way with it.

until now I have only used FTP for upgrading so that is why I ask what I am doing wrong with the commands to upgrade drupal

here an error message I get

It seems my project has exceeded resources available from my service provider, Bluehost.  I was upgrading my site from 8.9.5 to 8.9.11 but composer consistently runs out of memory.  Even using COMPOSER_MEMORY_LIMIT=-1 fails to work.  The site was created as drupal-composer/drupal-project but now I am hunting around trying to figure out the best way to upgrade it.  I was tempted to un-tar the core   tar file but hesitated because the architecture differs (the web sub-directory).  Bluehost is unable or un-willing to provide me with enough memory to execute this upgrade.  The upgrade went very

after updating drupal 8 i get this error

> Webform views require webform >=6.x 

If i run: 

> composer outdated drupal/*

Everything is up to date, webform is 6.x-dev

How can I solve?
 

The testing framework requires the PHPUnit package. Please run 'composer install' to ensure it is present.

After clicking Continue @ /update.php, we receive:

Fatal error: Cannot redeclare uc_order_views_data() (previously declared in /home/user/public_html/sites/all/modules/ubercart/uc_order/views/uc_order.views.inc:13) in /home/user/public_html/sites/all/modules/contrib/ubercart/uc_order/views/uc_order.views.inc on line 708

I am no Drupal professional, so do not understand what to do in this case.

Help appreciated.

Hello, I'm hoping someone may be able to help me out with this question:

I'm using the following packages for my Drupal installation:

"drupal/core-composer-scaffold": "^9",
"drupal/core-recommended": "^9",

Everything is working fine. I see a bunch of themes located at drupal/web/core/themes

Eg. bartik, claro, classy, engines, olivero, seven, stable, stable9, stark