How to enable deveoper mode in magento

There are 3 modes.

1. Default
2. Developer
3. Production

To check which mode is enable.
run : php bin/magento deploy:mode:show

 
To enable developer mode type the below command

php bin/magento deploy:mode:set developer


To enable production mode type the below command
php bin/magento deploy:mode:set production

Note: Compilation is only required in production mode. if you are in developer mode, you do not need to run compilation.