How to create standalone AssetBundle Yii2?

Question

Yii

How to make your own AssetBundle in Yii2 so that this bundle can be installed later with the github composer?
I'm just starting to use the composer)
You need to create a bundle from css, js, img files. And so that these folders are as a separate project) If you want to help and answer, please write as detailed as possible.

Answer 1

Such assetsBundle is in any widget. Just open the code of any widget and take a look.