Design development for a website
 

I want to start developing WordPress-based themes, but I don't know where to start. Does anyone have any ideas?

I've seen many training courses and online tutorials, just Google.

It depends on how much do you know about web development and design. My friend was excited when he found out about WordPress because he wanted to open a store and sell cars. He thought that the interface of WP is intuitive and user-friendly, so he can create his own design and save money. He was using free tutorials to understand better how the system works, but after a few months, he gave up and hired a specialist from https://stylemixthemes.com/motors/ to create a unique design and image. It's hard to understand all the features of WP and it's better to let the qualified specialists do their job.

Yeah, you right! WP is not user-friendly at all and you should hire someone.