I'm offering next week joining classes for both knitting and crocheting. I've done a bunch of these over the years and some are completely different from anything I've seen.
To prepare for the crochet class, I have made 48 4inch blocks, so far. These are a combination of granny squares and blocks made in rows. Each pair will be a different join. Some are variations on a theme. I'm doing the joins now. Some are sewn. Many are crochet. Quite a number are JAYGo, This means join as you go.
My next part is to do a similar number of knit blocks. There are fewer methods for joining knitting. Most will involve a crochet hook or yarn needle. A couple will involve knitting needles.
A picture will show up soon of some of them.