I will give you the basic two commands that are really life savers, if something does not work in your VPS server.
What are they?
1) $$>>> sudo chown -R www-data:www-data /var/www/html/directory_name
2) $$>> sudo chmod -R 755 /var/www/html/directory_name
The command recursively makes all permissions 775 on the files / directories which follow. That is why the -R is there. This is a real life saver if you get caught in permission issues. This comes in handy for Laravel/Nodejs/Django installations.
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