There are two ways of learning to read machinist blueprints. The first is to attend classes of a local school, for example a course offered by the Jones County Junior College or the Cuyahoga Community College. The other way is to participate in an online course.
The online lessons are often self-paced and don't require commuting to a school. Many online courses also offer the possibility of interacting with a lecturer. It is possible to gain a certificate after successfully finishing an online course. For example, the Universal Class, Inc. offers its students the possibility to earn an IACET CEU certificate. The course is usually cheaper for participants who don't want a certificate.