Steins,Gate 0 VN. A beginner's Flowchart. (I still didn't finish all these routes (except for last two) and there is still another route (perhaps the True Route) which I haven't got into. :
Steins;Gate All Route - Album on Imgur
Steins;Gate 0 Review – Nigma Box
How Choices Change the World in Steins;Gate vs. Steins;Gate 0 - MonsterVine