What bacteria are distinguished by the way they eat?

By way of nutrition, bacteria are divided into 2 groups:
1) Autotrophs (organisms that synthesize organic substances from inorganic ones). Autotrophs are divided into phototrophs (organisms that use sunlight to obtain energy and substances) and chemotrophs (organisms participating in redox reactions)
2) Heterotrophs (organisms that feed on the secretions of living things and the living substances themselves). Heterotrophs are divided into 3 groups: saprotrophs (organisms that feed on the secretions of living organisms), parasites (feed on living organisms), symbionts (organisms living in cohabitation with another organism) and benefitting from them)