Panorama Sticher Overview
This tutorial and it's links below explain the different stages of panorama stitching and discusses the concepts involved.
Stitching Two Photographs Together
This tutorial covers the simplest usage of Hugin Photo Stitching Software, just taking two handheld photographs and sticking them together into a single image. Stitching two pictures together
Stitching Multi-row photos together
This tutorial covers a more complex application of Hugin Panoramic Stitcher, taking two rows of handheld photographs and stitching them together into a single image, using the automated Assistant. The same process can be applied to more than two rows. Multi-Row Photo Stitching
Simple lens calibration
This tutorial describes the application to obtain lens distortion parameters a, b, c. These parameters can be saved for reuse in future projects, or imported into a lens database such as lensfun. Lens calibration