Human evolution is supported by evidence from fossils, archaeological discoveries, comparative anatomy, and genetics.
A useful starting point is to explore the different hominin groups commonly discussed in introductory timelines. These include Australopithecus, Homo habilis, Homo erectus, Neanderthals, and Homo sapiens, among others.

However, evolution should not be understood as a simple ladder. Different human relatives lived at overlapping times, and some evolutionary branches did not lead directly to modern humans.
For an accessible introduction to the topic, see The Campus Review:
https://thecampusreview.com/stem/7-stages-of-human-evolution/Discussion question: What can fossils tell us about human origins that written historical records cannot?