When PST returns in less than a month, for the most part it will apply to the same goods and services that it did under the old Social Services Tax.  Exemptions included then, and now, will be things like basic groceries, food items, many services (including accounting, for now), admissions, bicycles and magazines, among others.
And if you missed it, you need to apply for a PST number this month, if it applies to you.  So don’t delay.
You can read more about PST at http://www.pstinbc.ca/moving-forward/faqs/ and you can get your PST number by going to the eTaxBC website