What topics do you think people tend to struggle with the most?

[Denver Gray]

I'm an oil and gas analyst turned RE agent I'm writing a book and starting a vlog just on my FB to try and educate people on both mindset of being an investor and what one needs to do to be able to effectively start to invest both in them selves financially and mentally to succeed in RE investing. What topics do you think need more coverage and which do you think are overdone... Mostly I'm fishing for ideas for content to explore.