Hi Vee, Welcome to All Things Plants!
Prayer Plant (Maranta leuconeura) is a lovely plant that prefers bright light but no direct sun and the soil should be kept evenly moist during spring and summer but slightly drier during the winter months. I'd suggest fertilizing (at 1/4 to 1/2 strength) only during the growing season which is Spring through early Fall; winter months are usually the time when most plants rest. Prayer Plants do require rather high humidity and brown and crispy leaf edges usually occur when the air is too dry. I'd wait another month before pruning; once the plant starts actively growing again would be a good time to remove any brown or dead leaves. My old eyes aren't seeing the white spots on the foliage in your photos but hard water will leave white spots on foliage. You can try removing the spots by gently wiping each leaf with a soft cloth moistened with dish soap.
