Part four Typography: expectation

Typography is thing that I really do not understand well. I know there are Sans Serif and Serif fonts. So, I am expecting that I will be able to better understand what font will be suitable according to a context of design. In last feedbacks I was told that my typography is a little too blunt. It is because I did not think about fonts as a communication tool, I have just saw nice font which I thought is suitable to my design so I put into it, that's it. I bought book Type and typography (Phil Baines & Andrew Haslam, tutor recommendation and it is great one, I am in half of the book), Thinking with type (Ellen Lupton), Typography (Gavin Ambrose/Paul Harris), I also bought some books from library: three series from czech well-known typhographer and 100 principles for typography work. We will see how my perception of typography will change after that part.