created 2D platformer on SFML & amp; C++, also created a card game on Android (Java + Libgdx). On C # created programs for working with the database.
The question is next. First, what should I choose? UE4 \ Unity?
Secondly. Where to start learning? The ultimate goal to create a game.

What kind of literature, video courses, etc.

Answer 1, Authority 100%

Selects are essentially not. If this is a mobile application, all the monitization is sharpened by Unity . Mobile publishers, in rare cases work with projects on other engines, and some do not work at all. If this is an action game on PC or console, then the garbage collection Unity , this is a coffin, shooter Resident Evil Umbrella Corps Sad example, there is no Stable FPS, whatever iron you have, despite the fact that there is a modest chart, and it is better to still Unreal .

Literature in my mindless. A lot of materials for study are provided by the developers of the engines, on all topics and countless examples of projects for examples, as from developers, as well as from people. For both engines the biggest community. Since the engines are most popular they do not have bad documentation. Well, docks from Microsite in the language C # (this is their product) the best, in all languages, for C++ they also have, for sure, too cool.