“Truth” is just a word invented by people which can be given any meaning we decide.
There is no universally accepted definition of truth, but most commonly, the word is used to describe each of a group of ideas that do not contradict each other. “The actual state of things.”
To discuss truth, we accept certain beliefs or assumptions. We assume that there is existence made up of things that have states or features.
Each person is a thing that exists and has their features or characteristics. Some of these characteristics are our senses that allow us to become aware of other things around us and their features. Our senses, however, give us incomplete and many times inconsistent information about the things around us. Our brain receives this information and processes it to give us an idea of our surroundings.