A serger is a very good investment because it enables you to finish off seam edges more quickly, and even sew entire projects in half the time it would take you to do them on a sewing machine. Sergers are expensive, though, which is why a lot of people don’t have them. Plus, they take up a lot of extra space.
If you don’t want to spend the money on a serger, and you don’t have the space for one anyway, do some research and see if your sewing machine has a presser foot attachment that can turn your sewing machine into a serger. I have one for my Singer sewing machine and I like it a lot. Just type the model number of your sewing machine into any internet browser, and you’ll probably find lots of additional attachments you can buy. Most of the newer sewing machines do have a serger attachment. Mine cost me around $20.
My sewing machine attachment was a little tricky to figure out at first, but I like it now. It doesn’t produce the exact same results as a serger, but it is definitely a good substitute. The difference is that you can’t sew and serge at the same time with my attachment — you can only serge. Personally, though, I like the way that a serged edge looks over a zigzagged edge, so the presser foot attachment works well for me.
If you do a lot of sewing, you’ll probably still want to invest in an actual serger, but the sewing machine attachment is definitely a good substitute until you can afford a serger.