Unable to create connection on MySQL Workbench Edition in Mac?
Common issues:


Is MySQL server running? check that by making sure you have 1 or more processes called mysqld
Is MySQL listening on the 127.0.0.1 address? Make sure it is not running with skip-netwoking or with bind-address different from 0.0.0.0, *, or 127.0.0.1 (it could be only listening on a public ip)
Is there an user called root? It should be there if you just installed it
Did you write the right password- in the latest MySQL versions, mysql gets installed with a random default password. You need to know that or connect to the socket (localhost + socket, not 127.0.0.1 + 3306) using the unix_autentication plugin
What error do you get? It is not the same to get a "could not connect" than a "connection denied"- the first one could be points 1 and 2, the second 3 and 4. Can you connect using the command line "mysql"?
Do you have the latest mysql workbench version? Latest authentication methids may not be supported on old workbench versions


This is a very common question, please read the manual first for troubleshooting: https://dev.mysql.com/doc/refman/5.7/en/can-not-connect-to-server.html