Write a brochure - markdown?

Question

Markdown

I am going to write a book-brochure for myself and thus systematize my knowledge.
Questions in order ( you can answer as "true\false" ):
1) Correct, what if I read & supplement the book in the reader, computer & on the web (mobile, etc.) - is Markdown an ideal option?
2) Is it correct that there are no online engines, storages (free) for such little books ?
3) Is it correct that a free-desktop application that allows you to format text through the GUI, but not save the result in markdown format, and because of this I will have to learn this markup language (and scribble text files in my code editors)? (I know, study there for a couple of hours, but still)
Or share your experience - how do you keep your notes, how do you systematize knowledge?

Answer 1

No, markdown cannot be considered the best markup language, although it, in principle, copes with its task.
You can store your notes on GitHub.
If you put the question like that, put OpenOffice write and use it, but it won't be markdown. Or, if you need to store these notes online, you can use Google docs, also without markdown.
I will add that the whole point of markdown is just the supposed ease of entering the markup (which takes five minutes to remember) manually. Therefore, it is not clear why you need both markdown and GUI to format them.
It looks like you went down the common reverse path of fitting a chosen technology to a vaguely formulated problem, instead of finding a technology to solve a well-defined one.