Operator: Equals (=)
Equals is used to compare a Field to a single value, it is used for fields of numeric, date/time, timespan and lookup fields (picklists, custom fields with a range of values, types, statuses, packages, projects etc.) It does not work for text fields, where you should use Contains and Does Not Contain instead.
Values can be either a single quoted, double quoted or unquoted value (useful for numbers etc.). Also, as elsewhere in the query language, where you use a string value, you can substitute a function call as well.
Priority is high (unquoted value):
Priority = High
Status is awaiting review (quoted value) for records of type script
EntityType = Script AND Status = "Awaiting Review"
All records belong to a single project called "Project X" (showing use of single quotes, but we could use double quotes instead if we wanted).
Project = 'Project X'
All records assigned to me:
AssignedTo = Me()