Hi, I’m new to Blender. I have a problem (Maybe). I can’t move my objects freely as it move every tile or whatever it is. but when i create new file, the object move freely. I have Tapped some buttons on keyboard but don’t know which one. Anyone can tell me the key or button? Thanks! 
Check you have not enabled snappining. Look at magnet icon on the 3d view header
Make sure the magnet button is off. (The U looking button)