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LingakuLingaku[sentence] + よ
よ at the end of a sentence marks what you say as news to the listener – something you know and they don't. English has no word for it. "You know" comes close, and often it is only a tone of voice.
Without よ these are bare facts. With it, the speaker is telling you because you need to know: a recommendation, a reminder, a warning.
ね is for what you both know. よ is for what the listener does not know. Someone says いいてんきいい天気ですね, and ×いい天気ですよ is the wrong reply: it informs them of the weather they just mentioned. Agree with そうですね.
よ on every sentence sounds like a lecture. Keep it for what is really new to the other person.
よ fits an answer to a question, and a correction.
These go beyond telling someone a fact.
On a suggestion or a request, よ pushes. That is fine between friends and heavy-handed with a stranger or a teacher.
In plain speech よ follows the plain form. A noun or a な-adjective usually keeps its だ; without it (きれいよ) the sentence sounds softer.