What words should you never start a sentence with?

You should not start a sentence with a conjunction, but the newspapers do that all the time now. You should not end a sentence with a preposition.

You should write "Words with which i shouldn't start a sentence"

Just for clarification purposes, most newspapers do not have the time to edit articles anymore, and online content is never edited. In addition, most article content contracts pay typically nothing to writers since they can create stories for the company and then "get their name out there." This in turn attracts only uneducated and unskilled writers since people with knowledge and talent will not work for free. Thus, most newspaper content, especially online content, has been crafted and printed without any editing by people that would be forced to take remedial writing classes in college.