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Be active in the forum/answerhub!
That’s my advice, because you can learn so much when you just post some stuff into the forum and try to help people -> that’s how I learned UDK 
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+1 : Play the funny game " try to help even when you don’t know the answer " then you’ll usedocs.unrealengine/latest/INT/ for your searches and will hunt in docs forums and answerhub. But before that : go see and try all tutorials you find and marketplace epic stuff (content example and bueprint office usually have 50% of the replies you’re looking at ^^)
And more more more important : Have fun ! is the only thing which will send you back to engine when you’ll be bored or annoyed. Choose a project you like and “doable” and do it and ask help to the community when you are stuck.