Forgetting small things often happens because the mind isn’t fully present in the activity. Most people do things on “auto-pilot,” while their thoughts are wandering elsewhere. That’s why they later can’t recall what exactly they did. For example, when locking a door, if you are already thinking about the next task, you won’t store the action clearly in memory. Later, doubt arises, and you may go back to check again. The same applies to many day-to-day activities.
The solution is conscious presence. When you do something, do only that, with attention. Instead of locking the door while thinking about tomorrow’s meeting, focus on the feel of the key turning, the sound of the click, and tell yourself “locked.” This mindful involvement records the act strongly in memory. So, the key to overcoming this is not to force memory, but to train focus. Start with small tasks: eating, writing, or even drinking water. Do them with awareness. Slowly, this practice will strengthen your memory and reduce forgetfulness. When you do things consciously. It gets registered in the mind and you will never forget that.