Place a tablet by your bed for recording your dreams, and tell yourself when you go to bed to remember them. It takes some practice, but messages will start coming through if your deceased loved one is trying to communicate this way. When little things happen, don't assume they are just coincidences. Keep notes of the odd little things that happen - but again, don't be obsessed. You may sense a familiar smell, or thoughts may run through your head almost as if the person is having a dialog with you.
Little things do mean something.
There are no coincidences. Don't try to complicate the process. The messages usually come through in simple forms. When my deceased grandfather would visit me, I would always smell either green tea or vanilla ice cream. These are things he loved.