This is a very broad question and I usually don't have the bandwidth to help people on a one-to-one basis. I would suggest you to take a regular online class in this area instead. I have not follow up on the best latest class anymore. Stanford used to have very nice one but it looks like there are plenty good one in the last few years. I suggest you to google them. Equations in research paper is always hard. Keep pounding is likely the only way in familiar with them.