One important area of understanding is wing loading. How much weight is carried per square meter of wing. It is the all-up flying weight (pilot, motor, fuel, wing) divided by the wing’s projected area.
Sales literature may not always say flat or projected so double check that you’re using the projected value. Add up your weights, including fuel and wing then divide that number into the wing area.
For example, a Spice 22 has a projected area near 19 m². My 145 pound self with a 70 pound paramotor and 10 pounds of gas under a 12 pound wing gives an all up flying weight of 237 lbs. Wing loading is then 237 / 19 or 12.5 lbs per m².
This important value should be considered buying a different wing. Go here to see how.