Fabric softener is okay for clothes and I use it myself to soften my clothes.
Fabric softener works by softening the fabrics fibers to help reduce wrinkles, get rid of static cling and even adds a good smell to your clothes and laundry.
But some clothes do recommend you not use fabric softener and it should say on the clothes tag and if you use fabric softener on those certain clothes then it can damage the clothes.
But for most clothes fabric softener is very safe and good for clothes.