Is a 50mm good for portraits on aps c?

Here is what the site says about that.

From Pentax smc DA 50mm f/1.8: Pentax smc DA 50mm f/1.8: A prime lens by Pentax for APS-C cameras, 50mm f/1.8. The cheapest fast portrait lens for Pentax APS-C bodies.

From Lenses: Your first lenses: 1. A standard zoom, 24-70mm or 24-105mm equivalent. The kit zoom is fine to start. 2. A fast standard prime, a 50mm f/1.8 on full frame or a 33-35mm f/1.4 to f/1.8 on APS-C. Low light, people, food. 3. Then add for what you shoot: a telephoto zoom for wildlife and sport (wildlife and sport), a wide zoom for landscapes (landscape), or an 85mm for portraits (portraits).

Quoted from this site's pages.