Tie of old color and adding new color

wanting to make shawl using up odd yarn ends and need help with ending and starting new yarn color. Do I have to tie off old color and start new color or can i carry the old color and how can I do this.:knitting:

Normally, you can just leave the old yarn where it is, when you pick up the new yarn. You just take the new yarn and continue knitting. Sometimes you have to fasten the old yarn around the new one by pulling on one end. Later, when you weave in the ends, things should be fine.

You can also carry the two colors at some point where you join the new yarn, and a few stitches later, or as late as you want, you can drop the first color and continue with only one.

Thank you for your help.