Thank Atul! Totally agreed with you. But I want to build it myself, so I can fully customize, and implement only what I need.

Thank Steven! SEO is a problem that I never think about. Shopify is really good, but I planned to do more customize and extend in the future, so it isn't my choice.

Thank Tiaan! It's good start for me.

If your codes are well-structure, you don't need to use !important. But in case of a helper class, you should use it to make sure nothing can overwrite it.

JavaScript :)

Architect