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How to upgrade from Drupal 8 to 9 with composer [blog post + screen cast]
This blogposts gives you a summary on how to upgrade to drupal 9 and fix all composer issues.
How to fix - symfony/string v6.0.8 requires php >=8.0.2 -> your php version (7.4; overridden via config.platform, actual: 7.4.13) does not satisfy that requirement.
How to patch htaccess file in composer.json - drupal 8
A composer update of your drupal can override changes to your htaccess file. With this snippet you can patch it correctly.
It is seen as a bad practice to add complete libraries to your theme in drupal 8. You should add these as packages to your composer file.
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