what the difference between ‘thank’ and ‘appreciate’?

talking on line we are talking on line now,the whole class can exchange their ideas together,it's really full of fun.and i was so lucky the day before yestoday that i came across a Chinese boy who's studied in U.S. for about two years and he can speak very good English and his voice is also very good.i got nervous when i was talking to him and he asked me:are you running?haha,i think it's natural for us to get nervous when we try something new,especially when we are not confident about ourselves in front of stangers who are excellent,but it's also very interesting and exciting to try new things.so i will keep on doing that.and i hope my friends on italki will give me some advice to get more self-confidence and share our ideas.and i really feel like to teach people Chinese.

First notebook entry: Introducing myself Hello,I'm Susan Xiong,I come from China.I study in a university now and I think I'm a kind of good student.I love English and I'm an active student in the class. To some extent,I'm quite outgoing,but I'm not very good at communication,expecially with stangers.I like to halp others because it makes me feel happy,but my social network is so narrow that I have very little chance to give somebody a hand and I fell upset about it.So I want to try something new,just like what I'm doing now. I'm very fund of English movies and music.My other hobbies are reading,photography,playing volleyball and so on.Recently,I'v recruited about twenty students who want to pass the CET4(it's a kind of English level text for the college students)but have difficulties to pass it themselves to my and my best friend's English club,.Ha ha,I'll soon become a 'teacher'. But I know my English is not very good,and there are still a lot that I have to learn.Sometimes I just feel confused about how to learn,i.e. I want to find more methods to effective learning but still have some problems.My purpose of making friends on italki is clear,on the one hand,to help others;on the other hand,to help myself. So,if you are interested in me,please contact with me.I'm Susan Xiong,who is looking forward being your friend!