How do you use each of the emoji reactions on dev.to?

The heart emoji clearly says "I like/love this"
The thinking face indicates "this made me think",
I ended up googling for the hands emoji because I was not sure what it meant, but according to emojipedia, it's Two hands raised in the air, celebrating success or another joyous event.
The unicorn seems similar in intent to the heart, in my opinion, saying something like "this is so cool`.