CSS has only one drawback - a steep learning curve. It is not instantly intuitive. You need to study it and understand it and only then it will ‘click’. You cannot get on a bike and ride, you need to learn to ride a bike. You do not just start drinking beer when you turn 21 - you need to learn to appreciate the taste. CSS takes time to learn and appreciate.
This tutorial is designed to help beginners get started on their own so WordPress and a pre made theme are a great way to dive in and build a website from scratch. You can of course design your own WordPress theme or pick up a premium theme such as Bridge, Divi or X-Theme from Themeforest which you can customise a fair bit. I have a post on fronted frameworks too if that helps you. learn to build a website