Per our oft-cited FAQ, and our frequent use of the disclaimer to consult one's own rabbi in matters of practical Halachah, we do not, as a matter of policy, accept questions, or provide answers, relating to personal Halachic matters.
But, while I agree with this policy generally, and a lay person could not confidently/competently, and therefore should not, consult a printed work of Halachah for a serious question about a complicated problem, much less ask strangers for an answer to such a question, what is so wrong about looking on the internet for matters of day-to-day Halachah and issues that are covered in plain terms in accessible, printed works (eg., Mishnah Berurah for common issues relating to Tefillah, such as arriving late; Shemirath Shabbath, aka Shmiras Shabbos Kehilchasa, for quick answers to common, practical questions on Shabbath)? If someone would normally look in those books for the answer, but doesn't have it handy, is there something wrong or lacking in asking a community, and by extension an online community? I've even seen questions posted on Facebook asking for Halachic advice. If someone posts an answer with a link to an authoritative text for reference, is that not sufficient? Note also that there are many, many websites geared specifically towards providing such answers.