terminology questions -- edge and ribbing

[Olha]

hello,

Is there a special name for the 'edge stitch', the one you always slip at the beginning and always purl at the end?

Also, I wonder what you call a double layered ribbing, the one you can insert elastic in? I am not familiar with these terms in English and most patterns don't specifically name them.

Thank you!

[salmonmac]

Sometimes patterns call for a selvedge stitch at each end of a piece but often it's just called an edge stitch. Whether you slip that st at one end or purl the st at the other end depends on how you want the edges to look. If the edge shows in the finished knitting or you want to pick up sts in the slipped sts or you just like the look, then go ahead and use it.
I've