I'm glad you are wondering how you can help the transgender community. With constant judgment and high levels of transphobia, it is greatly appreciated.
1. Ask people for their preferred name and pronouns.
Normalizing asking for people's preferred names and pronouns is inclusive and can lessen the amount of misgendering that can happen to a transgender person. If you get it wrong, that's okay! Correct yourself and move on, if you make a big deal about it then it could make the situation worse.
2. While some do, not everyone likes to talk about being transgender.
Some people love to talk about it and answer questions. But others prefer not to. Both are okay. If you are interested in knowing more, either ask them if a question is okay or educate yourself. There are plenty of online resources for you, like glaad.org.