What is the fundamental difference between plants and other living things?

The fundamental difference between plants and organisms of other kingdoms is their unusual method of feeding. So, only plants can assimilate inorganic substances and convert them into organic ones (the so-called autotrophic method of nutrition) and not resort to assimilating ready-made organic compounds. Despite the fact that some bacteria can also eat autotrophically, they, unlike plants, do not do this constantly, but combine this method with the parallel absorption of organic matter.