Upgrading Drupal

I need to upgrade  from D7 to D9. I figured to install D9 on my local Windows 10 pc and then try to load in the MYSQL data. This is no doubt a trial and error process, but is this doable or plainly a bad idea??

Hi

I have a Drupal site it was Drupal 3.9.

Drupal recommended to upgraded to Drupal 9.42. Which I did.

I then check admin/config/development and it says 30+ staged config files, are different...

I try to import but get errors such as

'The configuration cannot be imported because it failed validation for the following reasons: Unable to uninstall the MySQL module' etc.

So I think its something wrong with config files.

Hello,
for testing purposes, I create a new Drupal 8 installation using 

composer create-project drupal-composer/drupal-project:8.x-dev drupal --no-interaction

then I immediately upgraded it to 9 using

composer update "drupal/core-*" --with-all-dependencies

but I get a list of errors like

I am stuck in maintenance mode and nothing I have tried is working. I tried the ?q=user   ?q=admin and neither worked. I updated drupal to 9.4.2 and everything was great. I took the site out of maintenance mode when I finished I went back to check the status and everything was fine. No issues with the site. I also needed to update CTOOLS so I put my site back into maintenance mode, downloaded CTOOLS, unpacked and  deleted the CTOOLS folder in the module directory. I then replaced it with the new updated folder.

Hello, 

We are attempting to upgrade from Drupal 7.90 to Drupal 9 with Postgres DB, however the upgrade gets stuck on the below where it looks like its doing stuff but in fact it stays at 78% for over 24 hours. Our wiki isn't that big less than 2GB. There are also some errors in the logs that I can't seem to figure out which are below as well. I assume it may be trying to import files but can't and gets stuck.

I've been tasked with updating a Drupal 7 site to Drupal 9. The site has custom modules which are utilizing the "Field SQL Storage" module to build SQL queries to get field data. I have been unable to find much at all about what happened to the "Field SQL Storage" module in Drupal 8 or why it was removed. So I have a few questions I was hoping someone could answer: