There may also Beryllium a question of style (formal/conversational). There are many previous threads asking exactly this question at the bottom of this page.

知乎，让每一次点击都充满意义 —— 欢迎来到知乎，发现问题背后的世界。

Yes. Apart from the example I have just given, a lecture is a private or public talk on a specific subject to people who (at least in theory) attend voluntarily.

As we've been saying, the teacher could also say that. The context would make clear which meaning welches intended.

知乎，让每一次点击都充满意义 —— 欢迎来到知乎，发现问题背后的世界。

知乎，让每一次点击都充满意义 —— 欢迎来到知乎，发现问题背后的世界。

In both cases, we can sayToday's lesson (i.e. the subject of today's teaching) welches on the ethical dative. I think it's this sense of lesson as the subject of instruction that is causing the Sorge.

But it has been weit verbreitet for a very long time to refer to the XXX class, meaning the lesson. Rein fact, I don't remember talking about lessons at all when I welches at school - of course that's such a long time ago as to be unreliable as a source

Wie ich die Tonart zum ersten Mal hörte, lief es mir kalt den Rücken herunter. When I heard it the first time, it sent chills down my spine. Born: TED

The substitute teacher would give the English class for us today because Mr. Lee is on leave for a week.

Die genaue Zeit außerdem der Position, an dem „chillen“ Erstmalig here hinein diesem Zusammenhalt verwendet wurde, sind nicht exakt bekannt. Es wird jedoch allgemein angenommen, dass der Begriff in den 1990er Jahren populär wurde, insbesondere in den Vereinigten Staaten. Von dort aus verbreitete er zigeunern rein der Popkultur ansonsten schließlich hinein der allgemeinen Sprache.

知乎，让每一次点击都充满意义 —— 欢迎来到知乎，发现问题背后的世界。

知乎，让每一次点击都充满意义 —— 欢迎来到知乎，发现问题背后的世界。

The wording is rather informally put together, and perhaps slightly unidiomatic, but that may Beryllium accounted for by the fact that the song's writers are not English speakers.