Let me start first, I will give some tips from my own experience:
Before adding spagetti, give the bunch of spagetti a twist, then let go as you put the bunch into the pot. If the pot has round edge, the spagetti will spread out evenly in circular shape.
When cooking spagetti, adding a bit of salt can prevent the spagetti from sticking to the bottom of the pot.
I will share more next time.