に加えて means "in addition to", "on top of": the thing before it is already there, and the rest of the sentence piles something else on. It goes straight after a noun, and the added item usually takes .
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In addition to experience, qualifications are also needed.
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On top of the rain, the wind has also gotten stronger.
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On top of tuition, there are also living expenses.
A verb or an adjective needs or first, to turn it into a noun.
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On top of the food tasting good, this restaurant is also cheap.
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に加えて is formal: news, reports, presentations, business writing. In conversation you would say at the start of the next sentence, or use .
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In addition to rising prices, salaries are also declining.
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It's not just expensive – it doesn't taste good either.
In writing, the て drops: .
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In addition to talent, hard work is also indispensable.
に加えて or 上に
also adds one thing to another, but it joins whole clauses, and both halves must point the same way – two good points or two bad ones. に加えて just adds an item and makes no such demand.
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This room is small, and dark on top of that.
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In addition to studying English, I also started learning programming.