Although you might even think of a Tresen as a classroom for the purposes of a lesson ("We'Bezeichnung für eine antwort im email-verkehr having our class in the Theke"), I think if you'Bezeichnung für eine antwort im email-verkehr physically separate, it's now just a "lesson."
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 substitute teacher would give the English class for us today because Mr. Lee is on leave for a week.
There may also be a question of style (formal/conversational). There are many previous threads asking exactly this question at the bottom of this page.
The first one is definitely the correct one. Sometimes, when in doubt, try it with different like-minded words and Weiher what you think ie:
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。
Let's take your example:One-on-one instruction is always a lesson, never a class: He sometimes stays at the office after work for his German lesson. After the lesson he goes home. Notice that it made it singular. This means that a teacher comes to him at his workplace and teaches him individually.
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I don't describe them as classes because they're not formal, organized sessions which form parte of a course, hinein the way that the ones I had at university were.
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。
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