The most important parts of a building are the things we don't see.

We don't have a fear that the building will fall on us because we have confidence in the foundation of the building; same as HTML, HTML is the foundation of web development.

HTML, CSS and JavaScript are the core entities every web developer must learn whether your interest is FrontEnd or BackEnd.

Know the basics first before jumping to advance stuffs.

Make sure your scaffold is strong; this will enable you to develop good software that your users will have no fear of the roof falling on them.