Am I measuring the rough opening correctly? : r/Carpentry

Best Woodworking Measuring Tools and Marking Tools - An Ultimate Guide

Why was this door framed using extra 2x4 and shims on the left side? Should a larger door be used? : r/Carpentry

Rough Carpentry

How to Measure an Opening for a New Entrance

Universal Square 4-1/2 in. L X 7-1/2 in. H Aluminum Carpenter Square - Ace Hardware

Carpentry: What is wood checking and how can it be prevented? - Quora

PLUMB LEVEL SQUARE

Hanging Pocket Doors - Fine Homebuilding

How to Build a Door Frame

Frame a Door Rough Opening - Fine Homebuilding

Standard Door Sizes, Interior and Exterior Dimensions - Bob Vila