I have a question about photons. Not even sure if photons can collide but if they can then do they collide as waves, particles or both?

I have a question about photons. Not even sure if photons can collide but if they can then do they collide as waves, particles or both?
Yes, a pair of photons can collide, and if their total energy is high enough, they can form a particleantiparticle pair of some type (typically an electronpositron pair). As for whether they collide as waves, particles or both, quantum mechanically, there is no meaningful distinction between these options.
Personally, I would prefer the term "interact" rather than "collide". The latter just smacks too much of billiard balls and classical mechanics, which isn't the mental picture we would want to have of photons.
Another question about photons....do photons always move in a straight line or will they also move spirally or zigzag?
They can't move zigzag ( because such a trajectory is not smooth ), but they can move in spiral patterns around very massive objects. That is in fact what happens in the immediate vicinity of a black hole's event horizon.
The only scenario I can think of where this might happen is when a photon traverses a region where very intense gravitational waves are present; their trajectories may be distorted into wavelike patterns here.Sorry, I was thinking, like a sine wave
Essentially correct. They are following a particular kind of geodesics, socalled null geodesics.Markus may correct me here but my understanding is that photons move along geodesics (the shortest route between two points)  these paths are "straight lines" in plane geometry but may be curved in curved spaces.
Monopoles could lead to some interesting photon interactions...
That's a classical view which, because we are talking about individual photons, is incorrect. In quantum electrodynamics, a photon travels every possible path, the probability amplitudes for each path summing to produce an interference pattern. However, those paths that are furthest from the straightline path tend to destructively interfere, thus the straightline path is the path with the highest probability. This is explained in Richard Feynman's book, "QED: The Strange Theory of Light and Matter".
In the classical wave picture, one has Huygens' principle, which is applied mathematically to solve the homogeneous wave equation in fourdimensional spacetime.
I have a question someone with practical knowledge may be able to answer. If you had one of those old fashioned fuse boxes (not a curcuit breaker installation) and then removed a fuse from it, would the remaining outlet represent a monopole? If so, could there be experimental value in studying this?
As Markus has stated, magnetic monopoles do not exist, as far as we know. Dirac did point out that the existence of a monopole anywhere would necessitate a quantised electronic charge, which is what we observe, but you can't run the argument backwards  the existence of quantised charge does not imply the existence of a magnetic monopole.
Now, as far as your removedfuseasmonopole idea, it's deeply flawed, independent of the considerations of the foregoing paragraph. Removing a fuse simply creates an open circuit in an AC power distribution system. That prevents current from flowing, and thus prevents the generation of a magnetic field. No magnetic field means you don't even get a dipole, let alone a monopole. Perhaps you are unaware of what a magnetic monopole is. It is a magnet that consists only of one pole (that's the mono part)  a north pole or a south pole. Such a thing has never been found. All known magnets always have both a north and a south pole together, as first reported by Peregrinus in the 13th century.
I going to drift sideways for a minute....
A photon is traveling between two stars. It will follow a straight but curved line because of the two masses. Let's say I measure x amount of kilometres as the distance the photon travels from one star to another. The two masses then start moving towards each other in a straight line, will the distance the two masses travel be less than the distance the photon travelled? Or is it the same?
As measured by whom, and how ?
For an outside faraway observer, the photon propagates along a null geodesic, whereas the two stars in freefall towards each other will not. In any case, who measures what time and distance is observerdependent, so there is no easy and globally valid answer to this question, particularly also since the stars themselves have an effect on the geometry of spacetime around and between them.
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