It's really great that you help people with pc issues without charghing anything.
You learned me the valor of helping others without asking for something back.
There are a lot of xxxxxx who exploit people low knowledge of security. They are like some politicians that steal money from unconscious citizens, like robbers that circumvent good folks.
Luckily there are people like you that, as wikipedia, spread knowledge for free.
If only the world could start acting like you this would be a better place, and a lot of people would live a better life...