Yes, Anything you want to learn, you can learn by starting a “one” project. Nothing needs to scare you.
Let’s say you want to learn how e-commerce sites work. Amazing! Join someone who is already building in it at the early-stage level and involve almost everything. If you get paid for that work, that is a bonus. If you don’t, you still learn tons.
Or, start your own one: High risk, High return. (I don’t recommend this for everyone). If it is the first job, you most likely fail, but you will still learn significantly more than working for someone.
As I said, there is nothing that is rocket science. All you gotta do pick something, anything. And start doing it. More dig it, more you learn. And more you learn, the you can able to deeper understanding.
After one project, you will relatively not new to the field of your desire. Then you will keep iterate, iterate, and iterate….