What is the difference between a garter stitch and a stockinette stitch?

You would graft into each stitch as it is, purlwise for garter and knit for stockinette.

That's how its supposed to be. The stockinette stitch has one bumpy side, while the other is smooth.

Increasing purlwise hides the horizontal bar that occurs in increasing knitwise. This keeps the front more consistent in appearance. It is possible to make invisible increases on the knit side...

It is not a good idea to do a duplicate stitch over a garter stitch. It will not look good. You need to do it over stockinette stitch.

Yes and no. Since a seed stitch included both knit and purl on the same side, it won't look quite as good as working on a straight stockinette stitch. When...