Meaning of zì:
zì
自
Pronoun
(bound form) self; oneself
Zhè běn shū jièshào le rúhé tígāo zìxìnxīn.
这本书介绍了如何提高自信心。
This book introduces how to improve self-confidence.
Preposition
from; since
Zhè fú huà shì zì Fǎguó lái de.
这幅画是自法国来的。
This painting is from France.
Adverb
naturally; as a matter of course
Tā zǒng shì zìxìn de miànduì kùnnán.
他总是自信地面对困难。
He always faces difficulties with confidence.