Changing yarns at the end of a row

Finishing a row with an old color and starting a row with a new color…What’s the best way to do this? I’ve been watching the videos on changing yarn color, but I can’t decide how to do it. Since it’s the end of the row can’t I just cut off the old color and weave it in and start with a new color? Or do I have to try one of the methods where the two yarns are actually joined. :??

If its a new color, you will want to just start knitting with the new yarn and weave the ends in to their corresponding colors later.