learn about和learn from和learn to do 怎么用

首先从about和from还有to说起.
about指“关于”所以learn about 是学习关于某一方面的知识.例如：learn about how to swim.
from 是从...地方来.所以learn from 是指从某个地方或者人学到知识.例如：learn from my father
to do 是做什么事情learn to swim.