Google Is your friend 
The best place to find UE4 tutorials is on the documentation and wiki:
Any UE4 questions you should ask on here or the AnswerHub.
Here’s a couple of links to get you started on C++:
http://www.cplusplus.com/doc/tutorial/
http://www.learncpp.com/
Also if you have any questions regarding C++ then the Stack Overflow website is the best, literally if you have a question put it in Google and it will redirect you to a Stack Overflow topic:
And on a final note, you should probably look into getting a good book if you are serious and some Math wouldn’t help either