HTML5 is not difficult to learn. The hard part is to keep practicing for months and days. In the process of practicing, I don't know how many people give up because they can't stand the boring torture, so if you can really persist, it means that you have learned HTML5.
In short, if you want to learn HTML5 within a few months after attending HTML5 training, you must keep practicing. Only in this way can you learn HTML5 successfully.