LaTeX.org

tocloft and tocstyle are competing. You can only use one of them.

I don't get the question right now.
Can you give a minimal working example that demonstrates what you want or what does not work as expected?

Out of interest, how many pages does your document have, if you change it to 10pt?

The difference can be quite large, or very small, depending on how much control you enforced concerning floats.

10pt is the default for the standard classes, while it is 11pt for KOMA-classes. 12pt on the other hand, is quite large. But i think it is (was?) WORD's standard. Personally, i wouldn't use 12pt for a book. Unless it is for children, they need a bigger font size; maybe even 14pt. With children, i me...

Go to the library and look at the books. A ruler might be handy.

There is no standard, at least not that i am aware of.

https://tex.stackexchange.com/questions ... les-in-toc

Ever heard of setcounter? You could have made an example less than 20 lines long.

Can you provide a minimal working example? Just seeing the bib entries isn't really that helpful.

Welcome to the forum, you simply cannot use a two-langauge title the way you are trying.

Can you prepare a minimal working example so we can see the problem in more detail? Your document is cluttered with old, not-up-to-date, obsolete stuff.

Welcome to the forum.

Use the global option nohyperref and instead add
irectly before \begin{document}

As LaTeX can produce books, it probably can produce school books.

But depending on what you think is beautiful, LaTeX might not be the best tool for the job.