There are so many variants under the transgender umbrella now...
The masculine umbrella: Cis man, Trans man, (Demi-boy also sits under the non-binary umbrella)
The female umbrella: Cis woman, Trans woman, (Demi-girl also sits under the non-binary umbrella)
Third or other gender: Bi-gender, Pan-gender, Gender-fluid
The Non-Binary umbrella: Non-binary, Gender-queer, Androgyne, Two-spirit
Is how an individual sees themselves, the personal sense of ones gender. Gender identity can correlate with assigned sex at birth or can differ from it.
In most societies there is a basic division between gender attributes assigned to males and females, a gender binary to which most people adhere and which includes expectations of masculinity and femininity in all aspects of sex and gender: biological sex, gender identity and gender expression.
Some people do not identify with some or all of the aspects of gender, some of those people are transgender, non-binary or genderqueer.
Is an individuals behaviour, mannerisms, interests and appearance that is associated with a particular gender i:e male or female showing masculinity or femininity. This also includes pacific gender roles. These categories rely on stereotypes about gender.
While gender expression does not necessarily connect to sexuality, individuals often are misinterpreted as more masculine if lesbian and more feminine if gay, regardless of the individuals gender expression. These beliefs can lead to people misinterpreting an individuals gender expression based on their sexuality.
Is an enduring pattern of romantic or sexual attraction (or a combination of these) to individuals of the opposite sex or gender, the same sex or gender, or to both sexes or more than one gender. These attractions are generally subsumed under heterosexuality, homosexuality and bisexuality, while asexuality(the lack of sexual attraction to others) is sometimes identified as the fourth category.