asking question about what you don't understand

this site is very useful because if you don't know and understand anything in English, you can just pick up the section "ask question" and type what you want to ask. People answer your question. in this site, you only don't ask English questions. you can ask any kind of questions regarding the topics, for example, if you want to ask a question related to mathematics, you should choose mathematics section and then write the question. similarly if you want to ask English question, you should choose the English section and ask the questions. for this site you can use the following link

http://stackoverflow.com/   --- if you want to read about this site you can read the following information. to log in this site, the pass and email are in the unpublished post of blogger. Remember this site consists of many sites (each site means sections such as English. Mathematics, so on), so i think each one requires an account for example, English question section and Mathematics question section have different accounts

http://english.stackexchange.com/   ---- it is English question section. so by using this link, you can ask any kind of questions related to English. it is so useful to learn English when have something we don't know while we are learning English. by the way you need account for this English question section