Did you find the information you wanted?
Thank u for this mail.
I will try to rectify my problem.Thank u for your advice.
I understand that English is a tricky and difficult language for some people, even some who grow up with it. Since you say you want to improve, I'll help...
... a dot has a space after it when you want to end a sentence. See? In that case it is called a full stop or a period. Otherwise, in English, the dot may join-up the words on each side. In computers, a dot has a special meaning, like in a url, so it can be quite important to get this right.
... when you want to write "you", do so. The contraction "u" commonly stands for other things like "university" or "unit". It is only acceptable in telephone txt or sms messages where the additional keystrokes are a bit of a pain. On a computer keyboard, it is not so onerous, so when you use the contraction you are sending the message that you are too lazy to type two extra characters. This is very lazy indeed. You should consider, if you cannot be bothered to type two characters, why should anyone else be bothered to type many more to help you?
The only people with an excuse are quadraplegics who type via a rod strapped to their foreheads or twitching a limb. If you are one of these, I apologise. However, the quadraplegics I know pride themselves on clear and complete writing - these are people who have great difficulty communicating in real life so they are prepared to put in the extra effort to be clear online. Also, they don't want to look like a cripple.
... if you are really sincere about wanting to avoid a mistake, at least look like you are trying. It is inadvisable to repeat the mistake when you make the assurance, it can appear insulting in many nationalities. However, I know that if I attempted to write in many languages I risk giving offense also, so I'm not bothered.
In an international forum, clear communication is imperative. This forum chooses to restrict our language use to English, which, some people have commented, is often clumsy. You don't have to be good at it. Being deliberately bad is often counter-productive. Read the advise link in my sig and the forum rules for guidelines on the dos and donts of requesting aid online.