Xampp:

APP_URL=http://localhost

DB_CONNECTION=mysql
DB_HOST=localhost
DB_PORT=3306
DB_DATABASE=my_db
DB_USERNAME=root
DB_PASSWORD=

Mamp:

APP_URL=http://localhost:8000
	### --> port 8000 was necessary for me to add to be able to use my file and image upload locally
	
DB_CONNECTION=mysql
DB_HOST=localhost
DB_PORT=3306
DB_DATABASE=my_db
DB_USERNAME=root
DB_PASSWORD=root
	### --> default here: password 'root'