Can you become a professional by learning from the Unreal Online Learning (Unreal Academy) and if so how do you build a career from that. What can of jobs can hope to get from having those skills.
The academy is a great place to start.
If you want to be very employable with the engine, nothing will beat a killer portfolio.
It has to consist of games ( or arch viz, art etc ) that you’ve made yourself or in collaboration with others.
It will take a long time to make such a portfolio, and you probably wont get the skills you need just from the academy. You’ll also need to be good at taking things apart, finding out how they work and putting them back together in a different / better way.
You may also need to build your own engine version which you can customize, although I do think it’s possible without doing this.