Good Character

Q: How can I truly repent from backbiting? I can not find the person I have talked bad about.

Q: Is it kufr to mock the way someone smiles.

Q: If my dad asks me how someone is doing, for example if he asks ‘how is your uncle/auntie’ etc., is it permissible for me to say that the person is fine even though I haven't spoken to the person and I don't know how they are?

Q: What can one do to control his anger, cool his temper and prevent anger breakouts, and how does one get rid of any grudges or frustration one feels for another person?

Q: Can I give kaffarah for someone if I curse him during Ramadaan fast?

Q: How to deal with people who lie about you, tarnish your image, hurt you and deprived you of your basic rights. They constantly taunt you and pick faults in you? How to stay firm in faith when you see a liar and deceptive people to be successful in life while truthful and honest ones suffer? 

Is continuously praising oneself and thinking low of others permissible in Islam?

Q: If I ask someone to bring me water or to give me water, is it haraam for them to say no?

Q: Is mocking someone's appearance considered kufr because we are mocking the creation of Allah?

Q: What should I do when I have cheated in Quran hifz and I have only learned 20 parahs. Now my teacher wants to take tests from me. If I tell the truth it would mean great disrespect to my family. I am very depressed.

Q: Gheebah is a very great sin. الغيبة اشد من الزنا.

So lots of people take it lightly and will still end up speaking bad about people and ask that person forgiveness afterwards etc.

When a person speaks bad regarding another person, if it falls under gheebat, the persons good deeds goes to the person he has spoken ill about. Now if he asks that person forgiveness, even if the person forgives him, will he get his good deeds back? Or will it be such that he can now ask Allah for forgiveness as the person has forgiven him, but he'll have to restart his good deeds?

I feel that people don't realize the gravity of the sin of gheebah, and take it very lightly. Please advise. I'm not an aalima so I am afraid if I'm thinking wrongly so I dislike saying anything regarding it incase I am erroneous in this regard.