start a project

yarn init

adding a denpendency:

yarn add [package]
yarn add [package]@[version]
yarn add [package]@[tag]

adding devDependencies, peerDependencies, and optionalDependencies

yarn add [package] –dev
yarn add [package] –peer
yarn add [package] –optional

remove a dependency

yarn remove [package]

installing all the dependencies of project

yarn

OR

yarn install