If you have been read Some basic drush commands, you can use Drush by running drush cr command line. However, this way is not useful when you're in the development process because you need to run the command line every time you change the code.
I'll guide you follow 2 ways:
1. MANUAL CONFIGURATION
1.1. Copy example.settings.local.php in sites/ folder to settings.local.php and put it in sites/default/ path.