Depending upon your filed of intreset, start learning online via Epic’s/Unreal Online Learning portal.
Then in parallel to that, try a couple of intructor-led courses like in Udemy. Then start making your own prototypes as by that time you’ll have enough baisc knowlegde and practice to start prototyping your own things. Target small things, use your learned skills and search online or these forums if facing any problem. Unreal Engine has a very good and cooperative community. 