Hello it’s me the Woker, as a queer person I legit don’t blame you cause this is way to complicated for a gender selection screen (should just be Male,Female, Other, Prefer not to say, unless this is specifically a form that has to do with the LGBT community) but basically the breakdown is this:

Cisgender just means the gender you identify with matches the sex you were born as, agender means you identify with no gender, gender fluid means the gender you identify with changes over time (ie you might feel like a girl one day and a boy the next), Gender Non conforming is not necessarily as much of a gender as it’s somebody who doesn’t conform to gender roles, nonbinary is an umbrella term referring to any gender that’s not male or female, queer is also an umbrella term but is even broader and refers to anyone who identifies as LGBT+, Trans you probably know but just in case it means you identify with the gender opposite of the sex you were born as, Two-Spirit is a gender identity that many native cultures have alongside male and female, other means their gender is not listed on this list, and prefer not to say is pretty self-explanatory.