Previously enabling raspbian, meant you have to boot to the card. Then enable and configure ssh service.
But with since 2016, there's a simple method. That is on the boot partition of your SD Card, create an empty file with name 'ssh' - without quotes - and when you boot from this SD Card, SSH services are auto-enabled.
To create the file you can use following commands:
Touch creates the file and sync ensures that it's written to the SD Card, flushing any pending write buffers for the SD Card.