Upgrading Drupal

As I haven't as of yet, discovered a way to get composer to run with an existing site, I would like to ask if it's too much to ask that modules display every version's compatibilities and requirements?

For example:
requires: core v.8.8.0, module xy v.345, module xz v.654
compatible: core v.8.8.9, module xy v.349, module xz v.658

that would considerably reduce current trial-and-error method when upgrading.

After upgrading to version 8.8.5, I can't access the main web page, but I can log in to the admin panel. When I turn on the verbose logging funcionality I receive the following error message:

Drupal\Component\Plugin\Exception\MissingValueContextException: Required contexts without a value: view_mode in Drupal\Core\Plugin\Context\ContextHandler->applyContextMapping() (line 155 of core/lib/Drupal/Core/Plugin/Context/ContextHandler.php).

Hi,

Please anyone let me know to how to properly upgrade a drupal 8 module via composer.

Hi,

I did made the struggle to get my website from D6-D7. But now a new challenge to get from D7-D8.
I use more than 300 'special' nodes from the https://www.drupal.org/project/weblinks module. A great module till D7 to use content together with a link to an outside source. I used this module already in D5, D6 and D7. But now in D8 there is no convertion.

Can anybody may be help me to migrate my more than 300 weblinks nodes to D8 links nodes?
Thanks a lot in advance!

greetings, Martijn

I admit I don't know much of anything about how D8 works with Composer and Drush.
I've been using Drupal since v4 but this the the first project I've tackled like this.

Hi folks,

Soz if this has been answered before I did look but got lost in a sea of info (I'm old - doh!). I have a D7 site on shared hosting. I built a new D8 site in its own Drupal8 sub directory in the D7 main directory. D8 looks to be working fine and pages all connect to each other in the D8 directory structure as expected . The old D7 site also works fine with no cross linking to the D8 directory. I now feel brave to switch off the D7 website. Whats the best way to do this?

Tnx in anticipation.

Bren