Spelling and grammar
English is not everyone's first language. Not everyone has perfect language skills. As such, don't comment on other peoples' ability to spell words correctly or construct sentences. If you cannot understand their meaning, you may let them know in a nice manner.
The forum is an English language forum
Threads must be posted in English. If you need to post a short phrase in another language, provide an English translation with it. If it is found that you have posted something in a language other than English which breaks the rules (eg. the bad language rule, or flaming), you will be infracted for it.
Other languages are allowed in signatures and user titles etc, however a translation should be provided in this thread.
There are some threads to help people learn other languages. English translations are required in these as well.
1337-sp34K (or variants) is not considered English language. "U" instead of "you" is mildly tolerated, but some grumpy old-fashioned moderators may be annoyed by it.