Join as you go crochet means connecting each new motif directly to its neighbors as you finish the final round, avoiding a separate sewing session once every square is done. I use this method for most of my blanket projects specifically to skip the tedious finishing step. This guide covers the technique.

How It Works
On the final round of each new motif, replace the usual chain spaces at the corners or edges with a slip stitch or single crochet worked directly into the corresponding space of an already-finished neighboring motif, locking the two together as you complete that round.

Frequently asked questions
Is join as you go faster than sewing squares together later?
Generally yes, since it avoids a separate finishing session with a yarn needle once every square is complete, though it requires committing to your layout as you go.
Want the sewing method comparison too?
See when sewing together after finishing offers more flexibility.
Compare joining methods