Soldor wont stick to my arduino

[strong apex]

ive been trying to soldor on my arduino and for the past hour all the soldor sticks to my wire AMAZINGLY but the soldor just seems to be reppelling the arduino, im so confused why it wont stick.l

[modest flame]

Make sure you're heating up both the wire and the hole on the Arduino - don't just heat the solder 🙂