Undergraduate, in order of level of education:

Associates (typically 2 years, some people get them and then transfer to a bachelors program. Other times the associates is all you need to start working. Some people start at the bachelor level)

Bachelors (usually 4 years, some people start here)

Graduate, in order of level of education:

Masters (You cannot start here. You would need at least a bachelors to apply for a masters program. Usually 2 years of more specialized education, often builds on what you learned in undergraduate)

Doctorate (You cannot start here. You typically need a masters to apply for a doctoral program, but sometimes people do joint masters/doctoral programs. Docotoral programs are usually research based, but not necessarily. I think they typically take 5 years)