On one of my posts, where I posted an answer at the same time that I asked a question, I got several negative votes for someone telling me not to use the site for my personal notes.
It was a sort of post where I had something that confused me yesterday, which no longer confused me.
I would be surprised though, if it were against stackexchange policy, to use the site the way I was - on every question there is a prompt saying " share your knowledge Q&A style".
An answer to Answering your own question says "do not omit important information from a question", which is something that I tend to do when making my own notes. Thus it is probably impolite to use stackexchange in this way.
My question is whether this behavior could get me suspended - If not I plan to make many more posts of this type. I find it very useful to note down in a place that I can access anywhere, what was confusing me because I will tend to forget a month later what was confusing me.