I've been using grids for a while but made the mistake of manually creating my own guides at the edges and a crosshair in the middle. For every new frame, I always had this as a layer or group that I would hide or show to help identify the edges and centers of my composition.
However, today I figured out how to achieve this using layout grids, allowing me to toggle them on and off with Shift + G whenever I want. Highly recommend.