I want to show you the safe way to cut through spaghetti squash.
Use a serrated knife to cut the ends. Cut just enough to give a straight edge, so you can work with it, safely.
Some will tell you to take a large knife, and cut down the center of the squash. Have you ever tried that?! It is very difficult, and you don't have a secure knife. This puts you at risk of injury. Do not do it like this!!!
Instead, use a paring knife, and circle your way around the squash.
There are two cutting lines, in this photo. I wanted to point out the curved line is using the large knife. See how you start to lose control of the cut. It goes the way it wants to. Looking at the line, using the paring knife, you can see the cut is straight.
Once the squash is halved, use a spoon to scoop out the innards. The seeds can be roasted, the same as pumpkin seeds.
Here is the comparison: The top photo, I used the paring knife and got a uniform cut. The bottom photo, I used a serrated knife, but was having a tough time cutting, so I enlisted the help of my santoku knife. It was a difficult task, and the end result is a sloppy, uneven cut.