This is my first question here and I'd like to ask something that has been bothering me for a while.
Some words written in kanji can be read using both onyomi and kunyomi of some of the kanji and the meaning of the word stays the same. An example can be "every month" - 毎月 which can be read both まいげつ and まいつき. If such a word is written only, how does one know how to pronounce it? For example when reading a written text aloud.
It seems that the question is not very clear/too broad. Let me narrow it down and ask specifically about 毎月. Don't worry about any other words.
If I have a written sentence
How do you know to read it: