Add password to root MySQL on Mac (brew)

ERROR! The server quit without updating PID file

• A: Try brew services start mysql
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Table 'mysql.role_edges' doesn't exist

• A: Try mysql_upgrade -u root
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Access denied for user 'root'@'localhost' (using password: NO)

• A: Try mysql_secure_installation and follow instruction to setup new password.
  Credit to StackOverflow.