Can someone explain like I'm 5 years old how the sun works (details)?

I’ve googled this of course, but it’s not sinking in all the way.

What I’ve got is: due to the gravity of the star, it creates an inward pressure? Then there’s the hydrogen and (I forgot the name of the other one) that join together and create deuterium, and that joins with another and creates another element, so on and so forth.

I probably messed that up, but I’m wondering specifically how the “nuclear reactor” works. How is it “creating” that energy?

Give me what I want, I only want nice people to answer.