When I was a wee lad, (I did that for my English friends). The schools taught Pounds, inches, miles and the like. When I hit middle school (that's 7th & 8th grade where I was), schools started trying to push metrics. I have a general understanding. I have to convert to approximant American in my head. My wife uses metrics being a doctor. It will be a hard push to convert the USA completely. One thing I always found interesting is electricity is all metric. Watts, Ohms and voltage are all measured in the metric system. I understand that completely. Its hard changing what you have been taught as a kid.
Yet I was taught a boy is this a girl is that. Here I am learning that is wrong. I may have fiddily bits but I'm a girl. You can teach an old dog new tricks. The dog just has to want to learn 😁