Just start saying 'they' for everyone that's work related. No matter on LGBT status.
Makes it easier to not fuck up.

Probably wouldn't be a bad idea to do something along the lines of stating upfront that "if anyone in the company does anything to offend you, please report it to the appropriate channels. You'll have our full support. We're here to get work done, not to make people feel bad"

You're not likely going to say by accident something they haven't heard before, or to offend them in a new and novel way, But establishing and occasionally reinforcing the fact that they don't have to tolerate it, that putting up with abuse is not part of their job, and that they have the boss's backing at the same level of the non-LGBTQ employees should they find themselves being abused or offended, would probably go a decent way in minimizing the risk of something actually bad happening.

Treat them like anyone else by default and make accommodations if you need to and it's reasonable.

You're asking with good intentions, but the best answer for any group will always be that. Shit, not even by groups. On a human by human basis just do that, there's a crazy amount of human variation and it's not always obvious.

This is not a comprehensive list, but you should probably avoid talking about your sex life.

First of all, good for you for asking the question. I think many people are afraid to ask these things even if they want to be respectful and inclusive for fear of coming off as backward or ignorant, but I think asking questions in good faith shows that we're willing to listen and learn.

But most importantly, just treat them with the same respect you'd treat anyone else! Gender identity isn't really that big of a deal, and after you get to know some trans folks you'll come to that realization quickly that they're just regular people!

Im trans with over 10 years of experience in the industry

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There's really not a lot to it. We just want a basic level of respect and empathy. Respect their chosen names and pronouns, and don't ask them random questions about being trans unless they're open to it. Trust them when/if they talk about their experiences, they know more about themselves than you do. Reassure them that their job is a safe space.

Happy to answer any questions.

Edit: if you slip up on name/pronouns, simply apologize, correct yourself, and move on. We know people aren't always trying to be malicious. Hell, my dad still slips up on my pronouns.

If you wanna go the extra mile, skimming an ally guide for 10 minutes, looking up some terminology and concepts, would reduce awkwardness by a fair bit. I certainly would have avoided a half dozen missteps if I did some reading.

Im curious what could come off as a joke to you but would offend a trans person but not offend other (similarly aged) people.

If your joke might be offensive to anyone, its probably best to save it for outside of the workplace if you share it at all.

Not saying dont make any jokes, just that your jokes shouldn't be referencing someones gender or appearance or at the expense of someone else in general.

Generally, keep humor work related, and it'll be fine no matter who it is. Well, there's always that asshole that thinks you have to be a robot at work, but with that sort, it doesn't matter anyway.

Beyond that, either stay neutral with pronouns, or use those that a person introduces.

I promise you, just those two things are going to go a long way in establishing respect and camaraderie.

If you struggle with pronouns, apologize casually when the pronouns come up.

As a fellow old, the kids don't seem to necessarily get it that my brain is wired pretty hard not to change pronouns, but they do seem to appreciate the effort and the discussion that it's a challenge rather than just fucking it up with no explanation.

Otherwise, be mindful that they take a lot of shit for parts of themselves that are background attributes for the rest of us. They can get pretty tired of it. A friendly person who regards them as just people may be the best thing they can get from anyone.

Since there already are a lot of good answers, do it like in Full Metal Jacket "I don’t look down on you if you’re x, y, z or something - you’re all equally worthless"

https://m.youtube.com/watch?v=tHxf17yJsKs&pp=ygUiZHJpbGwgaW5zdHJ1Y3RvciBmdWxsIG1ldGFsIGphY2tldA%3D%3D

Your job is to train them. They're people. You're a person. Just go with that

I think if you love as a person them you'll be good.

That's what I do and it's worked out pretty great!

Just treat them with respect like anyone else. There are 3 topics to avoid in any work place for anyone: religion, politics, and sex life. That's just a good general rule for all forced mixed company situations.

Treat them like any other person. Their gender/identity should have absolutely zero impact on the ability to do their job. So you don't even need to ask this question. If you feel like you're walking on eggshells and scared of bringing up an offensive topic, then that's an issue with you, not with them. There's nothing that you say that should be offending them since it's absolutely irrelevant to work.

Regardless of who your coworkers are, topics like gender identity or politics should NEVER be discussed in the workplace. If you simply avoid engaging in those types of topics then you will be safe. Talking about those things at work is an absolute horrendous idea, regardless of who the coworkers are. Those convos don't belong in the workplace.

You're not a dick for getting someone's pronouns wrong... You're a dick if you intentionally and continuously misgender them on purpose.

Well, I think it's of upmost importance to hire a private security firm to guard the bathrooms. Anyone entering or exiting those bathrooms will now be required to submit to a genital confirmation. We'll have tighter security on those bathrooms than TSA guarding the airports from unauthorized water bottles, and 2 inch pocket knifes.

Because as we all know, urinating into a toilet, surrounded by makeshift stall walls, can be the most offensive thing in the world if you don't share the same set of genitals as everyone else in the world! Especially since those stslls intentionally leave a gap, so we can spy on others as their peeing. That's how important these genitals in bathrooms are! Gotta follow all the correct protocol for emptying your bladder!

I say all this to say that yesterday I peed on a tree outside, and nobody gives a shit.

As for your coworkers? Just make a concentrated effort to remember what they prefer as their gender so you don't say "she" instead of "he".

The only one that confuses me is "they", but it's still refering to just one person. Luckily I don't know anyone like that, because that one I'm sure I'd constantly accidently fuck up.