Hello Davood, Güvenmek and itimat etmek could be used in a similar way and hard to tell the difference but if you want to make a detailed difference; Güvenmek implies that whomever you feel that feeling for will not do any harm to you. Your secret is safe with them, you trust in them. Ona güveniyorum, kimseye söylemez. (I trust her, she won't tell anyone) İtimat etmek implies that the other person is respectable, whether with you or with others this person is trustworthy. Sana nasıl itimat edeceğiz şimdi? (How are we supposed to rely on you now?) Emanet etmek means entrust. Giving the responsibility of someone/something to someone else. Çocuklar sana emanet. (Kids are your responsibility) Dükkanın anahtarını amcama emanet edip yola çıktım (I intrusted the keys of the shop to my uncle and departed)

"Itimat etmek" and "Güvenmek" is the same mean but we prefer use to "Güvenmek" in everyday life. "Emanet etmek" is related to an object.

Sen iyi bir insansın, sana güveniyorum Sana hayatımı emanet ediyorum Bu yalandan sonra sana nasıl itimat edicez biz