If you're having trouble entering "normal" quotation marks, it's quite likely that your keyboard happens to be configured in an "International" mode. See the picture below for how to change this setting on a Chromebook.
If you're an international user, you probably already know about special two-key combinations to enter a variety of characters - including standard quotation marks. Consult the documentation for your computer's OS if you're not sure. For Chromebooks, this link has more detail:https://support.google.com/chromebook/answer/1059492