UNREAL ENGINE 4

I've been getting up to scratch with UE4 in the last few days, I've learned a lot of things that I had never got to know back in UE3/UDK. Ive leaned the ins and outs of the cascade system, I've learned how to make CPU particles and GPU accelerated particles, I want to eventually add a fog particles system to roll through my scene using alphas. So far I've made fire and I've been using the Unreal level blueprint editor to create light sources that have brightness variables.