Yes, absolutely, especially now in this era of shitty, fall-apart, fast fashion. Also, adding to this, I'll add info that I've found the most useful in learning to sew -
First off, there are three stitches that are really useful to know:
Running stitch - easiest and quickest to do, but weakest.
Ladder stitch - also very easy and quick, more sturdy, and also sometimes called an "invisible stitch" because the end result is pretty well hidden. Good for seams and tears.
Backstitch - a bit harder to do and definitely takes more time, also definitely more visible, but the end result is damn near indestructible. I used this to sew a couple chair cushions as a birthday gift for my mom out of scrap materials and the results have lasted years. I also used this to repair some couch cushions and take in a skirt whose elastic had failed.
Further Tips (from a non-professional, so keep that in mind):
*Threading the needle is the most difficult bit, but wetting the ends of the thread helps.
*If you tie off the ends, you're going to want to use a double knot. I've also heard a backstitch can be used to hold the string in place, but when I tried that, it came undone so I ended up having to tie off the ends anyway (but again, I'm not a professional seamstress, I just needed to get the job done).
*You'll also want the thread length to be several times the length of the tear - like 4-5 times, even more, especially for a smaller tear. This is because you'll need more length to tie off the ends, and you'll lose half the length of the thread at the very start (I recommend double threading - both for strength and because I've found it easier to do).
*Pins help hold fabric in place and so are particularly helpful for longer tears, or holes requiring a patch.
