It is true, as you said, of course this is very easy to think about and to be able to do this requires hard work on our part and finding things that we can do and give us income, but if we are not yet experts in the field we like then we You can look for a course that teaches this and study it well so that you become an expert in that field and can do work and give us additional income from the skills we learn.
It made me remember about being a jack of all trades or being a master of one. You choose your career path and either of the two will give you that better financial living when you are being paid high with those career.
Many say that it's best to be a master of one, they're right.
And there goes the others to be a jack of all trades.
Both are true and real, but if you're starting out. It's always best to focus on one skill and grow with that until you master it and then move again to another one that you can learn and earn.