Other than liquid water what factors could make way for life to be on Europa? I know that Europa has liquid water, but I just don't know if there is anything else on it that could give way for life.
Well, Europa is one of the closest moons to Jupiter. Jupiter is an extremely massive planet (317.8 the mass of Earth) which makes strong tides on Europa and other close moons, so Europa is torn a bit which results in so-called tidal heating underwater. Through this heating, the temperature underwater makes the subsurface ocean habitable despite the Jovian system not being in the habitable zone. There are so-called hot spots underwater for which plumes erupting from under the surface are responsible. Life could thrive around those plumes. 

So in other words, there is ideal temperature for life under Europa's surface due to tidal heating by Jupiter. On Ganymede and Callisto there may be a subsurface ocean too (though that's not confirmed) but they are farther away from Jupiter so there maybe isn't enough tidal heating, contrary to Europa.