Meaning of Islamic words

Q: I want to ask that what is the definition of ummat from the Shari'ah and general aspect? I have asked from general aspect because I want to know what should one reply to a person if he asks what is ummat? Also tell that is this word of ummat used in Qur'an and Hadith?

Q: A very common practise in electronic communication is to write inshAllah with capital A, alhamduliLlah with capital L etc in order to make ta'zeem of Allah's name. Is there virtue in doing this, or is it better to write "inshallah" and "alhamdulillah" without the capital letters, in order to avoid making it a bida'?