knitting with double pointed needles
 

Suggestions for knitting with double pointed needles. How do I continue with the yarn from needles to needles wihout a slack in yarn?

The gap between needles is called a "ladder". Hold the two needles close together, wrap the yarn and make sure it's not too loose then pull it through. For the first few stitches especially try to keep those two needles close. It really just takes practice once you learn a method that works for you.

As Jan says, a slight bit of extra tension as you change needles helps a lot. You can also try moving the join between needles over one st on each round or so. In that way the join isn't always at the same place.

This is for joining the work. What some knitters like to do is to cast on an extra stitch. They will slip this stitch from the right hand needle with the working yarn to the left needle and knit these two stitches together. This closes up that gap. I like to knit the first stitch with the working yarn and the tail. On the second round, I knit these two stitches together and pull the tail tight. You have to be careful with this so you don't twist the work. At the beginning of each needle, slide the first stitch as close to the tip of the needle as you can without its falling off. Knit that first stitch or two by pulling the yarn as tightly as you can. Then you can relax and knit the rest of the row. Repeat for each needle. I've noticed that this is particularly important for the first few rows. This is when you will get these ladders. If you get ladders the first few rows, it's almost impossible to correct it later on in your work. If you absolutely can't get it, try Magic Loop on circulars. This is what I use all the time. Again, with Magic Loop you have to be careful with the ladders at the start of each needle.