So, you might know them, and I might not know them well. But just to get us on the same page, here are the identities I feel comfortable with explaining. I get anything wrong, please tell me.

Cisgender- your gender identity matches your biological sex.
Genderqueer- an umbrella term for people whose gender does not match their biological sex.
Transgender- your gender does not match your biological sex. This can be a man in a woman's body, a woman in a man's body, or someone of either sex who doesn't line up with their gender, including...
Nonbinary- (did I spell that right?) a person whose gender identity doesn't line up with the binary of girl or boy. They are usually someone who identifies as neither.
Genderfluid- someone whose gender identity fluctuates. Sometimes they are a boy, sometimes they are a girl, sometimes neither, sometimes both.
Bigender- someone who identifies with two genders simultaneously
Pangender- identifies as alll the genders.
Demigirl- someone who identifies as a girl and something else, like nonbinary.
Demiboy- someone who identifies as a boy partly, and something else partly

Straight- come on, we all know what this means
Gay- primarily attracted to your same gender. Often used as an umbrella term for the LGBTQ+ community because people are lazy.
Queer- an umbrella term for non-straight people. It used to be a slur before the 1990s, when a LGBTQ+ activist group reclaimed it by calling themselves Queer Nation. People use gay instead of queer sometimes because while it is a reclaimed word, it is still painful for some people to use. (See? You learned something new. Unless you didn't.)
Bisexual- a person attracted to two genders. Look at the Greek roots bi- two, sexual- attraction /attracted to
Polysexual- a person attracted to many genders. Poly- many, sexual- attraction/ attracted to
Pansexual- someone attracted to all genders. I often see this as they are gender blind, and don't have preferences. Or, as my friend Klokat502 likes to say, "They like all the booty". Pan- all, sexual- attraction/ attracted to. Which means, if you have a decent grasp of the English language, you would know they are not attracted to pans.
Homosexual- primarily attracted to the same gender. Homo- same. (So when people say no homo, what they are really saying is that what they are saying is not the same as what they mean.)
Asexual- someone who does experience sexual attraction. This is on a spectrum, from dry as a desert, to occasionally experience sexual attraction, to experiencing sexual attraction, but only after forming an emotional connection.
Gray asexual- sometimes experiences sexual attraction, but very rarely.
Demisexual- experiences sexual attraction after having an emotional connection for the person.

(So, I'm not going to go in-depth with romantics because most of them have the same prefixes as sexual attractions, so you should be able to figure it out pretty easily.)

Aromantic- someone who doesn't experience romantic love
Demiromantic- someone who experiences romantic love only after a platonic bond as been formed.
Panromantic
Homoromantic
Polyomantic
Biromantic

And just because...
Polyamory- the ability to be in a loving relationship with more then one person. Not polygamy.

What did I get wrong?  What did I miss?  How do you explain your identity to nincompoops?

Also, my spellcheck recognizes nincompoops and not nonbinary.  What does this mean?!