How many threads do you need for a Backstitch?
Embroidery floss is a cotton thread used for stitching. Floss has 6 strands, but usually you will use only 2 strands at a time for stitching and 1 strand for backstitching. On Hardanger fabric (22 count) you usually will use only 1 strand; on 11 count Aida use 3 strands to stitch and 2 to backstitch.
How do you finish off a chain stitch?
Put the needle just under the first stitch, just past the beginning chain, and pull the tail under both loops. Pull the gap closed. Pull the tail to bring the two sides of the V together and close the gap. Finish the fake chain.