Basic web design-html, where do the style sheets go?

Hi! I have my 1st year web design exam tomorrow (i can drop it next year so i just want to barely pass!) I can do the html, and i can put in syle rules WITHIN the html i.e <style>....</style> but i was reading my notes and it says that it shouldn't be within the html markup but in a different... show more Hi!

I have my 1st year web design exam tomorrow (i can drop it next year so i just want to barely pass!)
I can do the html, and i can put in syle rules WITHIN the html i.e <style>....</style> but i was reading my notes and it says that it shouldn't be within the html markup but in a different syyle sheet. I am wondering, where do you put this? Do you just do it at the top lets say, and then add a link in the html or something? How do you start it, there's also half an example in my notes and it starts (or ends....can't remember!) with an exclamation mark

Could someone please help me! thanks!
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