After two years of doing keto, I STILL don't feel qualified to really answer this question. I am constantly learning new things every day. So I've crowd-sourced this post. Thank you to everyone who helped me!
Firstly, the best place I can recommend is Reddit. If you have never used Reddit before, it's an online forum dedicated to thousands of different subjects. The keto subreddit is a great source of information for people starting out. Go read the FAQ and if you have any questions you can search the sub, because chances are, your question has been asked before. Ketoscience is a great place to go if you want to get to the scientific stuff regarding low carb and ketosis.