Hello everybody. I am a 22 year old (M) and I work at an agency as an SEO consultant where all our client’s websites are created with Wordpress.

I’m now thinking to actually learn how to create responsive webistes with wordpress so I can begin to find individual clients to work with, on building their website and doing their SEO also.

But don’t know if Wordpress is still relevant or will be relevant in the future.
And if yes, where should I start to make fully functional and responsive websites?
And if not where should I focus on learning?