One of the chores I was responsible for growing up was taking care of the lawn. Each week I was responsible for mowing the front and back yards. Sometimes I’d take care of the neighbor’s lawns too if the neighbor was unwell or out of town.
By the sidewalk, along the garden beds, and down by the street curb, I had to use a weed whacker. It is from maintaining the weed whacker that I learned about two stroke engines and two cycle oil. That knowledge came in handy when I moved up to working on two stroke outboard motor boat engines.