What do I pay the real estate agent?

I’ve lived in my house for over 30 years and am thinking about selling, but I’m new to how this works.
I’ve heard there are new rules about commissions and that sometimes agents help with closing costs, does anyone know how that works now?
How much do I actually pay my agent if I sell? Who pays for what? And are there any surprises I should watch out for?
I’d really appreciate any advice, thanks in advance!

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