What is the difference between "bright" and "shine"? I can't understand it :(

Question

Answer

'Bright' is pretty much always an adjective (discribes a quality of something).
'Shine' can both be a noun and a verb.

bright light; bright day; bright shining; bright star etc. 
The sun was so bright! 
The shine was so bright!
The sun shines so bright! The sun is shining so bright right now!

Answer

brillar = to shine
da mucha luz = bright