There's a lot of useful stuff on this site for writers, and also for people who generally don't want to upset others.
There are profound reasons for why the language that trans people use to describe ourselves and our communities changes and evolves so quickly. In many cultures, non-trans people have for centuries created the language that describes us, and this language has long labeled us as deviant, criminal, pathological, unwell, and/or unreal.
As trans people have fought for survival, we have also fought for the right to describe ourselves in our own language and to reject language that criminalizes, pathologizes, or invisibilizes us. Just as there is no monolithic trans community, there is also no one “correct” way to speak or write about trans people.
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The purpose of this guide is to help all people practice more care toward those on the margins. Trans people must be understood as the authorities on ourselves and the language used to describe us. Not only does this mean that cisgender (non-trans) people need to practice humility and care toward trans people, but it also means that trans people—particularly those with educational, financial, and/or racial privilege—need to practice humility and care toward other trans people—particularly those who are folks of color, low-income, less educated, and/or elders.