I can’t tighten the hinge screws on the aluminum swinging screen door, the screws just spin without tightening. how can this be remedied

Brass screws are soft. You can easily twist the heads right off. This means you MUST be careful.

• Pre-drill pilot holes for the screws.

• Lubricate the screws. I use a stick of beeswax that I keep on hand. Just draw the threads across the stick to get a bit on them. You will be ASTOUNDED how easily a lubed screw drives. Some use soap on screws, which is probably ok for brass. It is bad for steel screws as it can cause them to rust.

• Use a drill-driver that will allow you to limit the torque applied to the screw.

It looks like a lockring is used to hold the screw in place. You'll have to hold the screw still and rotate the lockring, or vise versa.

Using a flat-head screw driver and mallet, is a common way to rotate lockrings. Though, you'll have to find a way to hold the screw steady, while you bang the lockring free.

• Place a flat-head screw driver blade against one of the sprockets of the lockring.
• Sharply rap the handle of the screwdriver with a mallet.

It's possible that the lockring is made of some type of softer metal, so grabbing it with pliers could easily damage it. Using a screwdriver and mallet applies force only in a useful direction, whereas pliers apply non-useful forces required for gripping. These non-useful forces may damage the lockring.