How did they make smeagol?

Smeagol, originally a hobbit-like creature from J.R.R. Tolkien's "The Lord of the Rings," was transformed into Gollum due to the corrupting influence of the One Ring. After finding the Ring, he became obsessed with it, leading to a split personality that manifested as Smeagol and Gollum. This transformation was further exacerbated by years of isolation and the Ring's dark magic. In film adaptations, the character was brought to life using a combination of CGI and motion capture technology, notably by actor Andy Serkis.