develop:
$ gatsby develop
build:
$ gatsby build
when install npm, use yarn add instead of npm install.
if it has some wierd problems when run gatsby develop or gatsby build, try delete .cache and public folders then do it again.
使用 netlify.com 自动部署， 使用起来相对方便， 即使不懂编程的也容易搭建一个博客起来