Zenchess: who: 3. Qh5? e6! covering both c5 and f7.
I assume you're new to chess so here's some pointers for the opening:
1. Don't move the Q out too early unless there's a good reason (e.g. wins a piece; mate). In this particular line, Black will eventually be able to drive the Q off with ...Nf6.
2. Always get the pieces out quickly; your goal is to castle quickly so you won't get mated early.
3. Always try to control the center; your pieces have more range.
4. Always try to threaten something, unless, in this instance, your Q has to go back where it came. It's not a bad idea to threaten something; just don't overextend or misplace your pieces to do so.
5. Always have a plan. For starters, playing the Pirc frequently involves control of e5/d4 and counterplay on the Q-side.
6. Always play normal openings (e.g. 1. e4, King's Indian, Pirc, Sicilian, etc.). Study GMs who play your favorite openings e.g. study Tal if you want to play e4. Use the opening explorer and a one-volume reference (e.g. Nunn, Fine, MCO) to study which moves are correct in the opening.