Newbie help: Laravel dependency issues and Composer 'Class not found' error after fresh install?

hey everyone,

i'm super new to Laravel, like, totally fresh. just trying to get a basic project running after a fresh install, literally following the docs. i thought it would be straightforward, but i'm already stuck.

the problem is, i'm hitting a 'Class not found' error, which I strongly suspect might be related to some obscure Laravel dependency issues or maybe some tricky Composer autoload issues, whenever I try to run php artisan commands (like artisan migrate or even just artisan list) or even when I try to access a super simple route in the browser. it's really frustrating when you can't even get the basic stuff working, you know?

i've tried a bunch of things I found online and in other forum posts:

• ran composer update and composer install multiple times, thinking maybe some packages weren't linked right.
• tried composer dump-autoload, crossing my fingers that it would fix any class mapping problems.
• cleared various caches: php artisan cache:clear, php artisan config:clear, php artisan view:clear – basically anything with 'clear' in it.
• i checked my .env file too, just to make sure the basic app key was there and my DB settings were at least placeholder correct. seems fine.

but no luck. every time, i get an error that looks something like this in my console:

PHP Fatal error:  Uncaught Error: Class 'App\Http\Kernel' not found in /var/www/html/laravel_app/bootstrap/app.php:14
Stack trace:
#0 /var/www/html/laravel_app/artisan(20): require_once()
#1 {main}
  thrown in /var/www/html/laravel_app/bootstrap/app.php on line 14

what am i missing here? is there a common setup step for Laravel dependency issues that a newbie like me would overlook right after a fresh install? what's the best way to debug this 'Class not found' error, especially when it's popping up so early in the project lifecycle? it feels like such a fundamental problem.

really appreciate any help, i'm pretty lost. anyone faced this before?