How do I determine if my front wheel is warped?
Lift the bike up and spin the wheel while you watch it closely, at the top of the fork.

The tire should remain centered between the two sides of the fork as it spins, and the surface of the tire should not move closer to nor further away from the top of the fork.

If you have rim brakes, the rim should remain in exactly the same place relative to the pads as it spins.

In cycling vernacular, you need to check if your wheel is true.

This video covers the entire wheel truing process: