Upgrading Drupal

Drupal has its core migrate module.

It need to enable migrate module and run the migration in url example.com/upgrade.

How do I run the url above with drush?

Is it using the drush command drush pm-update drupal to do the migration above?

Hello,
I am not veryprofessional with drupal, but I have already made several manual updates of the drupal core. Today I tried to update from 7.41 to 7.44, following step by stepthe update guidline. I deleted all files and folders from the live dir (except my customized htaccess, robots.txt and the sites folder) and copied all new files and folders from the 7.44 update to the live dir and started the update.php as admin.
The update.php tells me "no pending updates" and the report site still shows me version 7.41

I upgraded a Drupal site from 7.14 to 7.44 along with several modules. Followed all the steps in UPGRADE.txt including the upgrade.php, cleared the cache and took the site out of maintenance mode.

The home page is complete, but when I click on one of the links in the Navigation bar, I go to that page, it has the right title on it, but the primary content from that page is missing.

When I search in the database, I find the content. Its there, just not displaying. Here is an example
image of a page with missing content:

I recently upgraded my D7 install to 7.44. It's a multisite install and the default site logs seem to be working fine but when I visit admin/reports/dblog on the second site, it throws this error and won't show the logs:

Recoverable fatal error: Argument 2 passed to t() must be of the type array, integer given, called in /var/www/drupal/modules/dblog/dblog.admin.inc on line 295 and defined in t() (line 1463 of /var/www/drupal/includes/bootstrap.inc).

With the announcement that support for D6 is ending soon, I have to seriously plan for a migration now. I've avoided upgrading to D7 but will not go straight to D8. I'd like to get some general guidance before I go too far.

(1) I run a custom theme on my D6 site. Will this migrate to D8 or will I need to redesign it for D8?

(2) I make some use of Chaos tool suite, Drupal Wiki, Forum and Advanced Forum modules. Are these all migratible to D8?

i have migrate mysite drupal 6 to drupal 7 and add a file field in one content type, file field is not working it may error occured not create field and also content type, now how do i fix this error?