This video will go through reading construction drawings/blueprints at length. If you are interested in a shorter version there is a 10 minute Reading Drawings Crash Course video link below. The video will go through the following topics:
General layout of construction drawings
Symbols and abbreviations and their meaninings
Types of lines and their meanings
Dicerning where to locate specific information within the drawings

IF YOU ARE INTERESTED IN THE TEN-MINUTE CRASH COURSE INSTEAD OF THE FULL VIDEO, HERE IS THE LINK:    • Reading Construction Drawings - 10 Mi...  
Reading and understanding the GSNs
Understanding the difference between floor plans, site plans, details, sections, elevations, and schedules
Navigating drawings using gridlines and details
Finding the scale of the drawings
Determining specific dimensions
Reading and understanding door and window schedules and types
Reading and understanding foundation plans and footing schedules
Conducting a basic takeoff to calculate the quantity of cubic yards required in isolated footings