As i have also Unity experience i would recommend to Unreal Online Academy and here the “Twin Stick Shooter with Blueprints” Tutorial by Zak Parrish. Zak Parrish shows some basic concepts and even when i am not a fan of this genere the tutorial was an eye opener. There is also a part where he shows the interaction between Blueprints and C++ (you write and compile a little bit C++ but i have never experienced a problem). Generally i found many books and tutorial outside UR which show nothing better examples than in the official documentations (and often the same examples). Look also at the Content Examples.