https://www.hrc.org/resources/reporting-about-transgender-people-read-this
Number one. Understand what "transgender" means.
A transgender, a trans person, or a trans, is someone knowing their inner gender feeling is different from the gender they were assigned at birth.
It includes not only those who have completed the medical transition to align their internal knowledge of their gender with their physical presentation, but also those who have not or will not medically transition, as well as those who prefer to be identified as "non-binary" or "gender-nonconforming" or "gender-expansive" people.
Number two. Know the difference between
"gender identity",
"gender expression", and
"sexual orientation".
"Gender identity" is the internal concept of one's gender. It could be male, female, or neither. It can be the same or different from their sex assigned at birth. For many trans, they do not match.
"Gender expression" is the external appearance of one's gender identity. It is usually expressed through behavior, clothing, haircut, voice, which may or may not conform to social norms.
"Sexual orientation" is the emotional, romantic, sexual, and relational attraction to others' gender. It could be gay, lesbian, bisexual, straight, or another.
Number three. Understand what "transition" means.
"Transition" is a process that some trans undergo when they decide to live with their gender identity rather than the one assigned at birth, they are not becoming different, just starting to live openly and have their "gender expression" as their true gender.
Transition can include medical components such as hormone therapy and surgery, but not necessarily. Some trans are happy with non-medical intervention transitions while some others cannot pursue medical interventions due to expenses or health.
Number four. Know that the "transitioning process" isn't just about the surgery
It starts with non-medical gender-affirming process of about six month that has a lot of questionnaires and affirming actions through social means - changing pronouns, changing name and gender on legal documents.
Number five. Respect transgender people by using the name and pronoun they use
Number six. Be aware of the reality of many transgender people in the US
Transgender people in the United States are extraordinary diverse, coming from every type of community and representing every race and ethnicity, pursuing a wide range of professions and participating in various religious traditions.
Number seven. Refrain from contrasting trans with "real" or "biological" people
Transgender people's gender identities are real, and using false frame of comparison can contribute to the inaccurate perception that trans are being deceptive or less than equal, when in fact, they are being authentic and courageous.
Number eight. Focus on the whole person
It is inhuman to focus solely on the transition. Put the person at the center of the story, in the context of family, friends, and daily life.