How do I make an object appear quickly without using the opacity keyframe ? I don't want it to appear like its increasing opacity I just want it to appear like when you bring a layer on top of the other ?
You have two options here.
1) Trim the layer to start where you want it to appear. You can do this by dragging the handle of the layer to where you want it to start, or by going to the time you want it to start, selecting the layer, and pressing "alt+[".
2) Use hold keyframes. At the beginning of the layer set the opacity to 0, enable keyframing, then right click on the just created keyframe and click "toggle hold keyframe". Then go to where you want it to appear and set the value to 100. This will snap from one value to another rather than tweening between the values.
Thanks so much