A person who taught you a useful skill?

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My middle school physics teacher had taught me some useful skills. He was a senior person who was around 60 years old. He was my neighbor too. The most impressive skill that he taught me was how to manufacture a electronic toy car with the physics knowledge. At first, he designed a experiment and in the experiment he show us how to manufacture a toy car. I was so interested in it so I asked him the details after class. He warmly answered my whole questions and he encouraged me to make one by myself. So I bought all the materials and tried to manufacture it. Nevertheless, some days passed by, many problems stopped my process. So I brought my work to him and requested his help. He found out the mistakes of my work and he patiently told me one by one. Finally I understood and tried it again. Another three days passed, I eventually made it. And through this case, I raised my confidence and interest in physics and manual work. As I was growing up, I became being able to fixed many things with simple problems such as my cellphone, loudspeaker, and game player. I am grateful to him. Thanks to the skills he taught me, they make my life more convenient. How about you? Do you remember a person who taught you a useful skill? :)