I have a few questions on how to best behave to be as welcoming and inclusive as possible without sounding bad. I hope you guys don't hate me.

I'm just a straight male. Are my pronouns he/him? Is that how I should tell people? Do you actually tell them as you meet them ? Do I have to wait for a certain social cue ?

How about online. Should I tell people or have it on my personal profile somewhere?

And about respecting other people's pronouns. How do i figure them out ? Is it a big faux pas if I don't before I know them ? Is it a faux pas if I refer to someone I just met and I assumed to be male as he/him?

I've never seen anyone referring to anyone irl by non conventional pronouns. Is it an actual thing or is it currently being pushed to make the world a more inclusive place?

I'd love some help with all of this.