Your scenes can be any length. Chapter can be any length. It's all up to you. You decide. You write a scene with a sentence or two. That's said, when you're planning your stories, knowing approximately how many scenes you'll need for a short story, novella, or novel is useful. It just helps you to plan your stories.
7 scenes for a short story: 10,000 words.
27 scenes for a novella: 40,000 words.
60 scenes for a novel: 90,000 words.

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Writing tips
RandomThis book contains -Words to use instead of said, says, went, etc -Personalities -Characteristics - words to describe movement, looks, body language and more. and a whole lot of other things.