You should say, " I have lived there since I was a child." you can also say "I lived there when I was a child." so yes you are right to believe that the original sentence is not correct.

Your first example was correct "She is like a monkey." The second is not, you should say " She is as cheeky as a monkey." the comparison you are making towards the person should be noted in the sentence. Hope this helps.

Yes you can use all of the above prepositions that you mentioned. Here are some examples: "I walked through the city." "I was walking in the city today." " where you walking around the town today?"

It really does depend how freedom of speech is used in social media, I agree that everyone should have a voice, but using social media to voice opinions has changed in recent years, now we have cyber bullying and people who use social media sites such as Facebook and twitter to victimise others. Many good things have come out of using social media, for example to campaign for unheard of charities or for the people of a certain situation to stand up to a higher force as these usually catch the media's attention and change things for the better. As with any form of freedom of speech, whether it be online or not, It is how you use it and how it effects others.

You would not say "a credit" you can just say "I got credit".

Yes they are fine. :)

You can use English newspapers and watch English TV shows that will help you learn new words for conversation. You can also buy and English dictionary to help you see the spelling of new words, and look up the meaning of new words.

I would use the word "interests". Usually when we used the word "likes" in English in that context of a sentence, we would say "people have different likes and dislikes." The word "likes" on its own does not end the sentence well. I hope this helps, it is the best way I can describe it.