To what extent does Candide's character change throughout the novel?

Candide undergoes quite a profound change over the course of the book. Initially somewhat innocent of the ways of the world, he comes to realize through his numerous adventures that there are far more important things in life than worldly goods, such as wealth and material possessions.
He also learns that any kind of good life, however one defines it, has to be worked for; it doesn't simply drop out of the sky. This insight enables Candide to turn the tables on Pangloss and lecture him about what constitutes the best of all possible worlds. All may be for the best now, but that's only because one has worked hard for a better life.
The famous last line of the book, as mentioned by the previous educator, shows us that Candide has learned that true wisdom consists in concentrating on those things which we can control instead of constantly striving for the impossible or allowing ourselves to be tossed about by the winds of fate. In arriving at this insight, Candide has discovered himself.

The chief change in Candide is expressed in the last line of the work, when Candide says, "Let us cultivate our garden."
Candide begins his saga wholly believing the philosophy espoused by his tutor, Pangloss, that all is for the best in the best of all possible worlds. Then, after many horrible, over-the-top adventures, Candide meets a Turk. The Turk shows him his prosperous home. Candide believes the Turk must own many acres of land to live so well. However, the Turk informs him that he has no more than twenty acres, which he cultivates with the help of his children. He goes on to say that this work keeps them all from idleness, evil activities, and poverty. Candide sees the Turk living a deeply satisfying life.
As he goes home, Candide deeply ponders these ideas and states to Pangloss that the Turk's life is preferable to that of the six kings with whom they had recently dined.
Candide shows he has grown beyond being ambitious for the glories of this (not so) "best of all possible worlds." He has changed and matured, and he has learned that a simple life of satisfying work amid one's family offers the best chance of contentment. He has learned to think for himself rather than rely on his flawed tutor. He has learned too that experience is a better teacher than theories from books.