Basically phase is an angle of line joining the origin and the any point on the wave with $x$ axis of our reference frame and the word phase is defined for the single wave function. But the phase difference is defined for two waves.
To become a Certified Construction Manager (CCM), you must have a requisite amount of experience and/or education. ONE of the following: An undergraduate (4-year BA/BS level) or graduate qualifying degree. A 2-year undergraduate qualifying degree (AA/AS level) AND 4 years experience in general design/construction.
In order to become a property manager, most employers require post-secondary education in architecture, business, or property management. Candidates with this type of training are able to review detailed drawings, work with the construction trades, and make decisions about the long-term care of a building or property.