Composer life hacks

Switching between composer 1 & 2:

composer self-update --1   --> switch to composer 1

composer self-update --2   --> switch to composer 2

If you only want to install, upgrade or remove one dependency, you can explicitly list it as an argument:

php composer.phar update monolog/monolog [...]

composer dump-env dev - will generate .env.local.php (which you can change with your needs)

Installing tools globally:

php composer.phar global require friendsofphp/php-cs-fixer
or just 
composer global require friendsofphp/php-cs-fixer