creating a scene in the beginning was easy because i could zoom in all i wanted in order to do model the mesh, but after i place more objects i reach a point where it is hard to move around in the model space because it would slow down to a stop, also i cant just rotate my view and zoom into an object. I was wondering if i can change this. I've seen that by pressing "." i can zoom into the mesh, yet i would like to know if theirs another way so that i wouldn't have to do this every time. I've also tried changing the navigation auto depth on and off in preferences. (currently using Blender 2.8)
Alt-middle Mouse Button re-centers the view onto whatever point you click on. If the object you're trying to zoom into dissapears, try changing the Near Clipping settings in the n-Panel> view settings tab.