Kanji question

I'm self teaching and I'm just starting to push myself into understanding Kanji.

but something is confusing me and Im trying to find if there's an explanation.

I learned that 本 is book.

I then learned that the same symbol for 10 ( 十 )

with 本 means 10 bottles.

this confused me as to why it would not be 10 books

that lead me to learn that 冊 also means book. and

十冊 means 10 copies ( books, prints etc.)

is there a difference between 冊 and 本 or is it mostly because of how Kanji works with くんょみ and おんょみ