Many ants for many days.
If you see one or two ants on a rare occasion, it may not warrant treatments. These are most likely foraging ants from outside just scouting for food. If this becomes a regular occurrence or you find ants in large numbers you may want to call a professional.
Ants can be difficult to eliminate and do it yourself treatments generally don’t work. With ants, you can also make things worse and harder to eliminate if you don’t treat correctly. Most “sprays” on the market are the wrong product to use on ants even though they have ants on the label.
Discarded wings are from reproductive ants called an alate. These ants can be difficult tp control as they are coming out to mate and not to feed. It also means that you often have a colony in, under, or near your home. Cracks where the ants are coming in should be sealed and bait treatments should be made to eliminate the colony. –
Pushed up dirt or sand.
This generally means a colony is present.
Ants keep “coming back”.
Most likely they were not eliminated to begin with. Many treatments like “spraying” may only suppress ants. Colony elimination is the best strategy for long term success.