Single Crochet Join As You Go

This in-depth tutorial explains how to use a single crochet join-as-you-go method for joining crochet squares together. This is a very popular join technique used by many designers. It can be used both "as you go" or after you've made all of your squares.
This tutorial explains in detail how to make the join, how to plan joining your entire afghan worth of squares, how to address inside and outside corner joins, and how to work around the edge of your joined squares in preparation for a border.
Jump to a specific part of the tutorial:
00:05 - introduction
02:57 - overview and layout
07:46 - step 1, put a round of sc on square 1
09:39 - step 2, join square 2
19:09 - step 3, join square 3
25:33 - step 4, join square 4
32:15 - step 5, add a round of sc to the outside edge of your joined squares